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  1. #1
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    BMC Fourstroke 03

    Whew! It took quite a while to finish this bike but it was worth the wait! This bike was custom built from my other bike parts with some new parts included. The only new parts were the Shimano XT crankset, SRAM X.9 triggers, and Thomson Elite stem/seatpost. The frame I got from online (Thank god for eBay) and presto a Fourstroke 03 for less than $1,000! Suhweet! After 90 days of test riding this bike I noticed 4 simple details about it:

    1. I feel tall on it
    2. The rear end is very, very stiff (almost hardtail like)
    3. The bike is super fast uphill (given the right sag)
    4. The frame is more robust than it looks (see rear triangle)

    I still need to fine tune the front/rear suspension to get the perfect amount of plush. I haven't taken it to 24 hour endurance races or tight singletrack yet so I'll have to leave that special feedback at a later time. Where are all the BMC owners? I heard BMC is not mass produced so maybe that's a good thing? I'd like to talk to more BMC owners and get their feedback.
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    Last edited by mtbnachos; 11-01-2007 at 04:15 PM.

  2. #2
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    Nice bike.
    I built up one of these for my wife. She loves it. Blows away the Trek Fuel she came off, not that it's hard to do that.
    You don't see them everyday out on the trail. We have a few in our area.

    Here are a few pictures of my wife's bike.



    Egg

  3. #3
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    Sweet build Locotiki. I bet your wife was pretty happy. Where's yours? I live in San Diego and it's too bad there really is no local dealer that sells BMC because they make quality bikes in my opinion. So far in the 2 months testing the bike it's been pretty smooth. Still no enduro or epic rides yet so I'm eager to see what this bike can really do.

  4. #4
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    Just got me one of these bikes too.
    Still need to get other wheels . I took it to a pretty rough trail for its baptism this weekend and I was quite impressed. Also still need to play with the settings but just following the basic recommendation is was good already . love the traction ...

    see attached black beauty

    There are not much of them around , which is a petty , but I guess it has something to do with marketing and brand awareness of people.
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  5. #5
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    Nice build Minerva, what wheelset were you going to put on? Looks like you have a Fox RP3 shock, what year is your Fourstroke?

  6. #6
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    building it

    guess I will need another few weeks ( and the end of year bonus ) to decide on the wheels . Not sure yet if I am going for off the shelf or custom build . crossmax would be nice but I have the feeling a good wheelbuilder can put a nice set together too for a better price ( any suggestions ? , I do basically fast all mountain )

    Indeed the shock is an RP 23 and I must say I did not regret for a moment. Took it for another spin today on heavy duty uphill stuff and been experimenting with the PP setings . Looks like I got something for every trail type.
    This is the 2008 model , pretty similar to 2006-7 only the FS 02 was revamped this year and lost the twistahlegs in the process.

    I changed some parts while negotiating on the price and I got ax XT BB and crankset, Avid Juicy 7 an the Fox for the catalog price . stock it came with an RS Ario 2.2 which I did not trust from the reviews. Wanted the DT Swiss , but they have no network here in Japan so that was a risk didn't wanna take . I also cut the handlebars for my style ( an inch each side ) and put foamgrips by now.

    This bike has lots of grip.... I live in Japan and the trails here are pretty.... steep and uncivilised , or should I say , ....unridden , so I am totally in love with the rear grip this baby has.
    Tried the Epic , tried the Anthem , they did not hold up once the going gets rough....

  7. #7
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    Sag

    MTBNachos,
    what sag do you run on the front and rear. I went up to 30 percent this week and the grip was amazing. Not so plush, but good grip , like I want it basically , get some terrain feedback.

    at 15-20% it becomes harsh but rails the curves.

  8. #8
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    Quote Originally Posted by Minerva
    MTBNachos,
    what sag do you run on the front and rear. I went up to 30 percent this week and the grip was amazing. Not so plush, but good grip , like I want it basically , get some terrain feedback.

    at 15-20% it becomes harsh but rails the curves.
    Im currently running 20 on the front and 25 on the back. I still want to tinker with the Reba since there is so much adjustability. On singletrack I would prefer a bit more plush especially in the front. The fourstroke is so compliant and light on hills that you can probably go 35 sag on the rear. I'm gonna try that in a few weeks!

  9. #9
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    setting the sag

    I ran 30 front 30 rear yesterday as a trial and the front was diving a bit too deep on the descents.rear end traction was very good at this setting and claimbing very comfortable , even standing .
    running 35 in the rear was something I was wondering if it could work because on the forums you always see between 15 and 30 percent sag for most frames. But I think you my be right. At 30 the rear end still feels tight and it might handle 35 , not sure about the rebound speed at those low presures though . With 30 in the back I had to set it close to fastest rebound to handle consecutive medium impacts without packing up( like descending stairs on mountain trail about half a feet high each ) . So I hope the 35 sag still handles rebound well . ( it will be the limit I think )
    So my next tries will be 25/30 for better descending and 25/35 as high comfort limit setting. I am trying to find the comfortable sweet spot right now because I am riding pretty tough trails .

    After that I like to find a tighter race set-up in the range you indicated .
    The bike is just great, getting more and more fun out of it all the time ( I come from a hardtail )
    greetz

  10. #10
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    Yeah I found my sweet spot settings at 20F/30R. Downhill I find myself on the saddle half the time so the 30 sag is welcomed. I think it's perfect for technical XC for me. Also I might try something new like a 1 x 9 drivetrain to shave weight. I'm gonna put a single speed chainring upfront and keep the 9 speed rear, and eliminating the front derailleur. I will have to buy a SS chain guide and modify it to keep the chain from falling.

  11. #11
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    Mine is on the way! UniversalCycles has the fourstroke 03 frames for $736, but only 21" and 23" sizes. I will post pics when I get it built up.

  12. #12
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    Congrats! Can't wait to see your build and specs!

  13. #13
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    Quote Originally Posted by mtbnachos
    Congrats! Can't wait to see your build and specs!
    Well, I'll be moving everything over from my single pivot Diamondback SL Super.

    -PUSHed Fox Vanilla fork
    -Full 965 XTR drivetrain w/dualcontrol which I actually like
    -Just ordered from bicyclewheelwarehouse the dt swiss 4.2 and 965 hub wheelset and some Kenda small block 8's
    -Thomson seatpost

    I'll post pics when its built

  14. #14
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    Here's a pic of my Trailfox 02 (5")



    Build:

    Shock: Fox RP23
    Fork: RS Pike
    Shifters: X9 Twist
    FD: XT
    RD: X9
    Cranks: Race Face Deus XC
    Pedals: Ritchey Ti
    FW: Ringle Abbas/Sun SOS
    RW: DTSwiss/Mavic 321
    Tires: Kenda Nevegal 2.35F/2.1R
    Brakes: Avid Juicy 7
    Seat/Post: Kore Enduro/SDG I-Beam
    HS: FSA
    Stem/Bars: TruVativ Team
    Weight: 29.2 lbs

    I wrote a review the other day. Overall a fantastic trailbike. Climbs great and just eats up technical singeltrack downhills. It would be very easy to build much lighter. Frame & shock are 6 lbs even.

  15. #15
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    Yeah sweet bike.. How's that Pike treating you and what's the travel?

  16. #16
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    The Pike is great (140mm). I've got 7000+ miles on it over the last 2 years. I service it every other month.

  17. #17
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    Nice, 140mm is perfect for the Trailfox. That's some serious mileage and definitely making use of the bike haha. I was thinking of getting a Trailfox myself and putting a long travel Pike or Fox F in white.

  18. #18
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    the new wheels have arrived!!

    Hey guys,

    Finally found a nice set of wheels. Its' a bit of a classic choice but I am real happy with it.
    they're crossmax SL . no not the SLR's , that is a lot more buck. I must say this REALLY improved the handling, accelerates faster, more nimble, climbs better . ( still need to drop a bit off my own frame too...) the wheels made me so confident I had to use the
    " facebrake " . But 6 stitches in the chin later I still feel pretty good about my new bike and wheels . Now I need to get a new helmet too.... he he . the previous one absorbed the shock by cracking. I can't stop telling people how necessary bike helmets are . this is the second time one saves me from far more serious damage like this': .
    check out the pics.
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  19. #19
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    Sweet wheels Minerva, how does the acceleration and flex feel if any? Do you plan on racing with this bike? I'm thinking about getting SLR's and changing my drivetrain to 1x9 to save some weight and because I'm bored as hell. Just random FYI I haven't looked at this thread in a while because I'm too busy building a new 29er

  20. #20
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    yep indeed , going to race it in marathons, first of june I have a 100 km one.
    as for the wheels, I am not Mr. 6 feet drop or jump so for me these quite thin rims are enough. I actually think they are more than stiff enough. the bike handles and steers better than before. If i go stand on the pedals and apply lots of power or in fast curves I get a slight zzzinggg... from the brake discs so I guess there is some flex there. but hey I am 37 years old and 4 kg over my target weight. the flex is not going to make me loose races .
    ( weight is dropping by a pound every 2-3weeks so going the right direction )

    I am getting used to the bike now and I must say , I did 30% more mileage than last year , just because it is more fun...

    next change may be the seatpost or handlebar/stem combo . when the funds become available.

    More FS03/02/01 out there??, pics pics please...

  21. #21
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    Cool which marathon are you speaking of? Hmmmm my guess is you're gonna throw on some Thomson seatpost/stem combo. Always a good choice!

  22. #22
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    Hah , you guessed right Thompson being one of the candidates . but haven't made up my mind yet .
    as for the marathon,
    Its the 100 Km challange of mount Ontake here in Japan .

    http://www.powersports.co.jp/sda/07_otaki/index.htm

  23. #23
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    nasty BMCs you have there. Wanna share mine, by the way, BMC is still in its infancy from where I come from. I just set this up 3 weeks ago and it's not the best setup yet but there'll be some improvements in the coming weeks. I need to get rid of my fork and waiting for my Nobby Nics to arrive

    getting rid of the grips...too pink

    rear shocks

    Looks like a Swiss Knife

    Initial Setup

    I hope to set this rig right.
    Thanks for looking!!!

  24. #24
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    Thats a nice version . in red . I saw that on the site but I could only get black over here.
    I hear some good things about the DT swiss 190 damper. let us know how it is treatimg you . I am still interested in knowing other people suspension set up ( sag front vs rear )

    One more week before mine gets its marathon baptism . played with slighty comfy settings today and hope to have found the sweet spot between bump compliance and efficiency .

  25. #25
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    Thanks for appreciating Minerva

    Tried it yesterday on a clayish muddy trail just a 2 hours pedal from my place. Yes, the DT Swiss performed well though I need to fine tune the settings. My deafult setting for sag based on the rubber indicator is 25% based on my weight. I read around 105 psi on the shock pump. I couldnt say for my front shocks since it about to be replaced and the performance has been so so. I'm inclined to get the SID 2008 (I'm using the 28mm SID currently and the flex is the main issue). Though I'd love to get the Magura Durin but still, from where I come from this is way off the budget.
    What marathon race are you joining?

  26. #26
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    aaa
    Last edited by Minerva; 06-05-2008 at 06:16 AM. Reason: needs to be lower in the tread

  27. #27
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    race evaluation ( 100Km)

    OK,You've seen the bike , now I've properly tested it in marathon conditions.
    in short , sweet... This was a 100 Km race on Mt Ontake in Japan. with a total of 2400 meters climbing ( 7-8000 feet ) . Not a whole lot of singletrail , but lots of very rough cut fireroads, lots of rock , and in some sections loose rocks , mixed with mud and streams running everywhere ( rained the days before ) . well the bike did excellent. I could keep going for hours without getting truly tired because of the position ( and the planned pacing: start slow , stuff your face , then in the second half start ramping it up untill you hopefully can still explode on the last 15 miles ) In the easy stuff I locked out , but any downhill or rocky uphill I left the rear sus open. I noticed a lot riders having to put feet down on the loose rocks when climbing ( fist size or larger ) . But the fourstroke just mills through it if you got the right gear and of course a bit of a smooth spin . on the downhill also a lot of overtaking even though I am not exactly Mr. technical downhill.
    result 46th out of 800 , 6 hours and 33 minutes . the first arrived in 5hours 20 or so , but there were lots and lots behind me too. ( top 100 on that race is considered expert class I hear , I have no clue , just trained alot ) anyway , I was singing and cheering some of those cowboy yells ( jeehaa ) on the last hills out of pure fun!!! This machime really rocks on the long distance, happy BMC customer. cheers

  28. #28
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    Minerva

    That's one tough race and you placing 46th out of 800 is something. Wow!!! That's a feat for you...may I ask if you do XC racing for a living or is this just a hobby?
    are you joining the race in Utah in August?
    BTW, BMC should be reading your post I think they ough to send you goodies like a jersey or a windbreaker. If they do, hope they send me one too.
    BMC indeed rocks!!!

  29. #29
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    That red fourstroke is SWEET!

    I had a fourstroke 03 with the "trail" modification to 120mm travel in the rear, until I totaled it... Now I have the "Trailfox" frame which is very similar to the Fourstroke 03 with a couple added stiffners at the weld connections.

    Here are pic's of old & new...
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  30. #30
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    Nasty BMCs you got!!! Awesome!!! BTW, is that FOX stock or did you replace em. In SE Asia we are given the stock of DT Swiss as rear shocks. I'm just wondering if that was the original setup or did you replace them.
    Again, nice bike!!!

  31. #31
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    Quote Originally Posted by Meyrick
    Nasty BMCs you got!!! Awesome!!! BTW, is that FOX stock or did you replace em. In SE Asia we are given the stock of DT Swiss as rear shocks. I'm just wondering if that was the original setup or did you replace them.
    Again, nice bike!!!
    When I bought the Fourstroke frame two years ago, It was only available with the fox shock in the USA. I ordered the Trailfox fully expecting it to show up with an RP23. When I saw that it had a DT Swiss I was a little concerned, but after the first ride I new I was going to be happy. The DT Swiss rear shock is the real deal, very adjustable, very smooth and fluid through the entire travel, and a true lockout.

  32. #32
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    Bonking ... not feelin' well My BMC is going, going, gone!

    Yeah nice, I like that red. Is that the FS02? I don't remember the 03 w/ a DT Swiss shock. Looks like you're sporting red OURY grips that look pink? On another note I have sold my BMC FS03 , had to sell it. I dam near broke to tears when I boxed it up to FEDEX. However I will be back to purchase a newer FS, TF in the future and share it w/ you guys. Or how about a BMC 29er? Love to hear more ride reports guys! To be continued..............
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  33. #33
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    hi mtbnachos
    im using the FS03...and yes those are pink oury grips. kinda girlie so now i got the black lock on oury grips. am waiting for my Magura Durin 100 to replace that SID fork of mine.
    Am glad to meet you BMC addicts in this forum.

    Ride Hard!!!

  34. #34
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    Quote Originally Posted by Overthebars
    When I bought the Fourstroke frame two years ago, It was only available with the fox shock in the USA. I ordered the Trailfox fully expecting it to show up with an RP23. When I saw that it had a DT Swiss I was a little concerned, but after the first ride I new I was going to be happy. The DT Swiss rear shock is the real deal, very adjustable, very smooth and fluid through the entire travel, and a true lockout.
    Couldnt agree more on the DT Swiss

  35. #35
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    I am a 5' 11'' rider who wants to get a BMW Trailfox 2.0. Would a 19'' work for me???

  36. #36
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    Quote Originally Posted by ZIPPYZOOM
    I am a 5' 11'' rider who wants to get a BMW Trailfox 2.0. Would a 19'' work for me???
    Based on BMCs website...Yes the 19 will fit you to a tee for that height

    Ride Hard

  37. #37
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    here she is again sporting new a new fork




  38. #38
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    Hi BMCers,

    I would like some advice from you guys/girls who know more than me.

    I picked up this BMC fs03 frame for my girlfriend as an upgrade to her hard tail Giant Talon. I've been told it is a 2010 frame, but I think it may be a 2009 based on the colours.
    What I want to do is use as many of the parts I have to build up the bike, but I am not familiar with all the component options/compatibility. Having an original spec list would help (bottom bracket type etc) if anyone can point me in that direction. Or even suggestions on components types. For example, I think I need a top pull, bottom swing front much. And need one that will not interfere with the shock movement, but I have no idea what front much would fit the best. I have a deore rear derailleur that I think will work, but is there a specific rear derailleur that would be better, in terms of fit not function.
    The fork on it now is just what I had lying around and is 100 mm travel, but I don't know what the OEM travel was?
    The wheels are just a mock up set.

    The last image is what the bike looked like in the advert when u bought the frame.

    I know these are very basic questions, but and help or advice would be greatly appreciated but this bike build noob.

    Regards,
    Errol

    BMC Fourstroke 03-img-20141005-00202.jpgBMC Fourstroke 03-img-20141005-00207.jpg[ATTACH]undefined[/ATTACH]
    Attached Thumbnails Attached Thumbnails BMC Fourstroke 03-img-20141005-00205.jpg  

    BMC Fourstroke 03-img-20141005-00204.jpg  

    BMC Fourstroke 03-hubmarket-12909-0-72889200-1411556160_med.jpg  


  39. #39
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    Hi, I see no one has replied to the last post.

    I am not sure if I can help, but as a rider of a similar frame for 7 years I will say this....

    The front derailleur needed for my xs frame( I built it up from the frame) was hard to find. The weld on the bottom bracket forced a top clamp style. I got mine working excellent with a triple CR set up, but a modern single narrow wide chainring with 11 cogs in back would be the best for this frame. I will not_retrofit mine though. The frame is excellent!

    Mine came with the longer travel rear link.

    The Deore rear der is good. You should probably get a spare hanger. I have gone though 3 hangers over the years.

    My bike is all Shimano M960 XTR including shifters from the period. I even had the XTR wheels until I gave them to my wife to run UST tubeless in the desert when she leaves me for Sedona one week a year while work my ass_ off lol.

    Your paint scheme is cool. Mine is all black. That paint is durable on mine. Still looks good after all these years! I put carbon stem, and bars. Got the I-beam Gravity dropper and ultra light seat for it to offset the_dropper post weight.

    The head angle is steep compared to current geometry taste. I put a Talus fork on mine, and the long travel setting helps on the DH with slackening it, as well of course the travel.

    Love mine. I needed to get some bearings replaced. A local shop did it and they figured out the bearings no problem.

    Make sure to put locktite on the suspension bolts!!! Mine came loose on the trail on first rides and I was lucky to notice. The one behind the chainring is hard to reach and torque in the field. Do it with crank arm off before assembly.


    I put a seat dropper on mine, a gravity dropper a couple of years ago. A great thing. Lucky again as I risked a problem with this XS 15" BMC frame as you see the seat tube is interrupted by the shock linkage. My set up works with the seat post fully inserted after grinding off some of the post, for my ride height. I am 5'8" with 30" inseam. Bottom line, a seat dropper might not work on this frame depending.

    I didn't have a problem with the front_ der interfering with the shock.

    Edit to add:

    A serious problem I had with my build was the front der cable stop angle was welded on at an angle that caused too much friction on the cable. Made shifting crappy! Maybe BMC fixed that on yours. This was due to the super small bike frame size. A similar fault was that the bottle cage bolts were higher up on the down tube than optimal. Only a small bottle fits. Seems like the larger sized tubesets are used and simply cut shorter for the size with the bosses preassembled.

    I was able to carefully drill the hole in the cable stop out to give room for the cable to pass while still stopping the ferrule. Also, I use goretex cable on the front. Before I did that shifting the front was very poor.

    My suspension did creak a bit when it was new. But now it is quiet all the time. If it made noise I couldn't use it. I think it took a few hundred miles to break in or something. I did retighten the bolts a lot when it was new. Use loctite 42!

    I am due for a better and new bike. It still works but the shocks on mine are needing service soon, and the drive train will only last another season. Happily I ride other bikes, ss, hardtails, and a fat bike more of the time these days, but the BMC is the most capable bike in the stable.

    BMC Trailfox TF01/SRAM X0 Complete Bike | Backcountry.com

    Seeing that deal brought me to this forum. I know the link will expire soon.

  40. #40
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    Mine today in Henry Coe State Park, California, Dialed. Old school.

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    Hi Sorcerer,

    Thanks for the input and info!
    Much appreciated!

    Errol

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