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  1. #1
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    Gary Fisher Roscoe 650b?

    I want to purchase a Gary Fisher Roscoe 2 and want to know if anybody has tried to see if a 650b wheelset would work. Probably good to go in the front but not so sure about the rear. Need to know so I can sell the stock wheel set in new condition right away and order the 650b set. No shops around here have any 650b bikes to pull the wheels off and check. I dont care about front derailleur clearance because its coming off...Going 1x9
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  2. #2
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    I would assume not. The Roscoe swingarm moves forwards two inches as the wheel kicks upwards and you'd likely smack the tire into the back of the seattube. They won't clear much more than a 26 x 2.4, let along the 26 x 2.6 you need to safely go to any 650B bigger than a quasimoto.

    The quasi (according to shiggy's measurements) as I recall is a 344mm radius from axle center to tallest point of the tread. Double that and its 688mm which is just slightly less than 27.1" diameter. The NeoMoto 2.35 is 8mm more radius than that (27.7" diameter). In fact the only so called 27.5 which actually measures out exactly at 27.5 is the Racing Ralph 2.25. The Nevegal 2.35 is nearly 27.9". If Schwalbe went and offered the 2.4 width RR in a 650B format, I bet the thing would end up as 28" diameter.

  3. #3
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    Quote Originally Posted by DeeEight
    I would assume not. The Roscoe swingarm moves forwards two inches as the wheel kicks upwards and you'd likely smack the tire into the back of the seattube. They won't clear much more than a 26 x 2.4, let along the 26 x 2.6 you need to safely go to any 650B bigger than a quasimoto.

    The quasi (according to shiggy's measurements) as I recall is a 344mm radius from axle center to tallest point of the tread. Double that and its 688mm which is just slightly less than 27.1" diameter. The NeoMoto 2.35 is 8mm more radius than that (27.7" diameter). In fact the only so called 27.5 which actually measures out exactly at 27.5 is the Racing Ralph 2.25. The Nevegal 2.35 is nearly 27.9". If Schwalbe went and offered the 2.4 width RR in a 650B format, I bet the thing would end up as 28" diameter.
    Fwiw, all the Quasi-Moto's I've measured here are 699, or 27.51".

    Cheers,

    KP
    If you like my products and services tell everyone. If you don't, tell me - kirk(at)pacenticycledesign.com

  4. #4
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    Hey I'm just using the moses of tires's info. I haven't any quasi's to check myself but I've ordered some RR's just because they give me a tenth of an inch more clearance over my NeoMoto 2.35s.

  5. #5
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    I am curious if anyone has tried putting 650Bs on a Roscoe yet. I picked up a 2010 Roscoe replacement frame from a friend.

  6. #6
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    That's an interesting question. No one on a Roscoe can try that?

  7. #7
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    I put a 26" wheel with Nobby Nic 2.4" tires on my Roscoe frame. There was 15mm or more of space everywhere. I then compressed the rear shock all the way. There was 8mm between the tire and seat tube. According to my calculations that means if I got 650B rims and put on some 2.3 tires they would just touch seat tube at full rear compression......hmmm, its tempting to try.

  8. #8
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    I have a brand new Roscoe 1 (bought as a leftover for my son) and will try to fit up as best I can my 650B rear wheel from my Prophet. The standard 2.4 tires look really big with some decent clearance so the 650B of some flavor may fit. You'll end up with a high BB though. This is a very cool bike and for the price I paid a steal.
    2013 Banshee Spitfire V2 650b

  9. #9
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    Quote Originally Posted by thirdchute View Post
    I put a 26" wheel with Nobby Nic 2.4" tires on my Roscoe frame. There was 15mm or more of space everywhere. I then compressed the rear shock all the way. There was 8mm between the tire and seat tube. According to my calculations that means if I got 650B rims and put on some 2.3 tires they would just touch seat tube at full rear compression......hmmm, its tempting to try.
    Your calculations are right on the money.

    I fit the wheel from my Prophet on the new Roscoe. My axle is a 10mm thru so I had to kind of guess at the center point for the ABP skewer to tighten down so I tried it all the way forward and also centered.

    With a slightly used 2.3" Neo Moto it did not touch the seat post. Very very close but it didn't touch. No problems anywhere else I could see. At the very least with a small shim in the shock (or smaller tire) you'd be good to go for sure with this bike.
    2013 Banshee Spitfire V2 650b

  10. #10
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    hhmmm..
    lets see if I can borrow one to try out.

  11. #11
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    Has anybody made this happen on a Roscoe?

  12. #12
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    Like in my above post it will work and should be no problem with a 2.1 or 2.2 tire. Seatpost just cleared with a 2.3 Neo Moto. Might hit slightly with a 2.35 Nevegal which is a little taller. Worst case you add a small shim inside the shock to prevent any seatpost contact. At some point when I get the proper QR (not my current 10mm thru axle) for my Hadley hub I'll mount it up with some pics.
    2013 Banshee Spitfire V2 650b

  13. #13
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    Quote Originally Posted by skidad View Post
    Like in my above post it will work and should be no problem with a 2.1 or 2.2 tire. Seatpost just cleared with a 2.3 Neo Moto. Might hit slightly with a 2.35 Nevegal which is a little taller. Worst case you add a small shim inside the shock to prevent any seatpost contact. At some point when I get the proper QR (not my current 10mm thru axle) for my Hadley hub I'll mount it up with some pics.
    Awesome.

    I prefer the meat up front (2.3-2.4) and skinny in the back (2.1-2.2) for my XC/Trail/AM rides, so this is great news.

  14. #14
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    Jsut wondering if there are any pics yet?

  15. #15
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    Sorry for resurfacing a dead thread, but, any pics yet?

  16. #16
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    Hi I am deciding if to build my Roscoe with 26" tires or 650b tires which would you recommend. I will like to do the 650b but would to feel good about my decision?

  17. #17
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    Quote Originally Posted by jborges View Post
    Hi I am deciding if to build my Roscoe with 26" tires or 650b tires which would you recommend. I will like to do the 650b but would to feel good about my decision?
    I'd love for my Roscoe to be 650b... But the wheel set and tires are too new to justify the conversion right now

  18. #18
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    Quote Originally Posted by hokiebrett View Post
    I'd love for my Roscoe to be 650b... But the wheel set and tires are too new to justify the conversion right now
    Ok but I would like to know if I am going to be ok with it.

  19. #19
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    Quote Originally Posted by jborges View Post
    Ok but I would like to know if I am going to be ok with it.
    We can't answer that for you. If you feel 650B is for you, then people here are saying that a Roscoe should be able to be ran 650B.

    Owning a 29er, I'm stoked about 650B for my AM/trail rig.

  20. #20
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    Quote Originally Posted by hokiebrett View Post
    We can't answer that for you. If you feel 650B is for you, then people here are saying that a Roscoe should be able to be ran 650B.

    Owning a 29er, I'm stoked about 650B for my AM/trail rig.
    Ordered the 650b wheelset stans flow ex will order neo moto tires

  21. #21
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    Quote Originally Posted by jborges View Post
    Ordered the 650b wheelset stans flow ex will order neo moto tires
    Sorry for my previous tone (re-reading it sounds a bit snarky), I misunderstood what you were asking.

    How has the GF Roscoe 650b build up gone?! Seems to me this bike would be a blast configured that way.

  22. #22
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    jborges -

    Let me know how things work out. I have finally acquired all the parts to build up my 2010 Roscoe III frame including a set of Blunt SL 650B wheels and Schwalbe Nobby Nics. I hope to get the bike built in June. I have various 26" wheels I can put on it also......should be fun to see the difference.

  23. #23
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    Quote Originally Posted by thirdchute View Post
    jborges -

    Let me know how things work out. I have finally acquired all the parts to build up my 2010 Roscoe III frame including a set of Blunt SL 650B wheels and Schwalbe Nobby Nics. I hope to get the bike built in June. I have various 26" wheels I can put on it also......should be fun to see the difference.
    Any updates?!

  24. #24
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    Gary Fisher Roscoe 650b?-roscoe.jpg

    Finally got around to building my Roscoe. It has SLX brakes and an SLX drivetrain, a Fox Float FL fork and Velocity Blunt SL rims with SRAM X9 hubs. The tires are 27.5x2.35 Nobby Nics that are a tad snug in the front and when I decompress the rear shock all the way they just touch the rear frame. I orders some Hans Dampf 27.5x2.25s which should fit better.

    So far the ride is nice and more stable compared to my 26" wheels I also have for this frame. Unfortunately, we are getting up to a foot of snow in the mountains tonight so I might not be able to get this bike out for some real tests until next spring.

  25. #25
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    Awesome! Any idea how much the BB was raised? Or, what is the new BB height?

  26. #26
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    Quote Originally Posted by hokiebrett View Post
    Awesome! Any idea how much the BB was raised? Or, what is the new BB height?
    I measured 7/16" difference using the same size tire. 12 13/16" versus 12 3/8".

  27. #27
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    Quote Originally Posted by thirdchute View Post
    Click image for larger version. 

Name:	roscoe.jpg 
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    Man that thing looks mean. wheels look well suited for the bike, not too big. Wouldn't even know they're 650b vs 26. I love the blue too!

    So far the ride is nice and more stable compared to my 26" wheels I also have for this frame. Unfortunately, we are getting up to a foot of snow in the mountains tonight so I might not be able to get this bike out for some real tests until next spring.
    Where are you located? Any more ride updates? I missed a group buy on some Chinese 650b carbon rims, but I'm thinking I'm gonna go 650b for the Roscoe before I buy another pair of 26 tires. I am really, really, really intrigued by a 650 Roscoe.

    Are you running a 140 or 150 fork?

  28. #28
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    I'm in Bozeman, MT which is in the SW corner just above Yellowstone National Park. My riding on the Roscoe has been limited since right after I finished it a series of storms have rolled through dumping snow above 6,000 feet & all the real technical stuff I ride is between 6,000 and 7,500 feet. (The good news is we're going to have a great base for ski season.)

    I'm hoping to get it out on some lower single track with some sharp hairpins this weekend which should give me a good idea on how it maneuvers compared to 26" wheels. Unfortunately the trails won't give me a good idea on how much better it climbs on single tracks littered with tree root and rocks which is the main reason I wanted to go 650B.

    I decide to go with a 150 Fox fork since Fox forks tend to have a slightly shorter axle to crown length than other brands. So far is seems to fit just fine.

  29. #29
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    I got the Roscoe out on some fairly technical single track this weekend. The trail is basically a 12" to 18" wide rut usually around 4" deep. It sometimes has a parallel track that isn't a rut but usually rougher due to horses.

    Overall the Roscoe with 650B wheels and 2.25 tires worked nicely. I was surprised at how much better it kept momentum during gradual climbs. The bike did much better rolling over the stretches of the trail that had been roughed up by horses. Handling wise the bike felt like I had gone up one size in frame providing added stability while not sacrificing much handling wise. I didn't have any issues navigating the few sharp hairpins on the route either going uphill or down. One big advantage of the Roscoe with bigger wheels is I hit my pedals on the side of the rut much less than when on my Giant Trance X.

    The trail has a few 4" to 6" ledges at the ends of the bridges and a couple drops around 6". I didn't manage to bottom out the rear shock on any of those even though I was purposely trying to. I did find an old old farm building foundation near the trail which provided a 15" or so drop-off. When I took it I did manage to bottom out the rear and got a slight skid mark on the back of the seat tube so I probably won't try to push it with bigger tires.

  30. #30
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    Salivating. Clearance/rollover for roots and rocky clbing is the biggest thing I want to address. My AnthemX 29er feels like it'll roll over anything making the 26er Roscoe feel like it'll get bucked by a stone.

    So you did swap out the rear to 2.25? Still running a 2.35 up front?

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    I put a 2.25 on the front also but will be putting the 2.35 back on for next weekend ride. I'll let you know how that goes.

  32. #32
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    Quote Originally Posted by thirdchute View Post
    I put a 2.25 on the front also but will be putting the 2.35 back on for next weekend ride. I'll let you know how that goes.
    I've got basically your same set up. 2011 Roscoe 2, Fox 150 CTD up front. Currently running a balloon of a Bontrager XR4 2.35 up front and think I'd have plenty of room for a big tire. Prefer a 2.2 in the rear, so all of this is great news! Looking forward to less pedal strikes as well!

  33. #33
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    Quote Originally Posted by thirdchute View Post
    I put a 2.25 on the front also but will be putting the 2.35 back on for next weekend ride. I'll let you know how that goes.
    Did you check the 2.35 tire to crown clearance with all of the air out of the fork? There are a couple 650b wheelsets on CL locally right now. My 2013 F150 CTD is subject to the Fox recall, so I'm re-investing into the Roscoe and buying the 2014 FIT damper upgrade option.

  34. #34
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    Quote Originally Posted by thirdchute View Post
    I did find an old old farm building foundation near the trail which provided a 15" or so drop-off. When I took it I did manage to bottom out the rear and got a slight skid mark on the back of the seat tube so I probably won't try to push it with bigger tires.
    And just to clarify: that was with 2.25 Nobby Nic tires not 2.35 right? From what I remember, the 2.25 Nobby Nics are fairly high volume.

  35. #35
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    I got my Roscoe down last night (riding season is over here) and did the measurements. There is about 1/3rd inch between the tire and the fork arch. When I let all the air out of the fork (which compresses it well below anything I ever have while riding) there is well over an inch between the tire and the closest it gets to anywhere on the frame.

    Out of curiosity, before I put the bike away for the winter I let all the air out of the rear shock and had a friend put all his weight on the rear frame. When he did that the 2.25 Hans Dampf tire just touched the frame and had almost no drag....it probably won't have any after I put a 100 miles on the tires.

  36. #36
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    Quote Originally Posted by thirdchute View Post
    I got my Roscoe down last night (riding season is over here) and did the measurements. There is about 1/3rd inch between the tire and the fork arch. When I let all the air out of the fork (which compresses it well below anything I ever have while riding) there is well over an inch between the tire and the closest it gets to anywhere on the frame.
    Thanks!
    This is specifically what I'm trying to avoid:
    Gary Fisher Roscoe 650b?-1358832082349-216ho6cgw827-670-80.jpg
    Can't tell if that fork is a 32 or 34 though. The 34's don't clear 650b like the 32's do.

    EDIT the bike appears to be a Santa Cruz TRc, which should have a 125-140 F32. Can't tell how big of a high roller they are running.

    Quote Originally Posted by thirdchute View Post
    Out of curiosity, before I put the bike away for the winter I let all the air out of the rear shock and had a friend put all his weight on the rear frame. When he did that the 2.25 Hans Dampf tire just touched the frame and had almost no drag....it probably won't have any after I put a 100 miles on the tires.
    2.25 Hans Dampf, thats' a pretty big rear tire. I was thinking a 2.2 Kenda Honey Badger or 2.2 WTB Wolverine

  37. #37
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    My fork is a 150mm 32 Float RL. There is more than an inch where that tire is hitting.

  38. #38
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    Thanks. Im reaching out locally to see if I can find some wheels/tires to test fit before I shell out for new wheels.

  39. #39
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    Ok, parts are ordered!

    Wheels: (Haven't decided) either the Hope Pro II Evo's with Stans Flow EX wheels, or Sun Ringle Charger Pro/Pro SL's. Have both to choose from, will sell/return other.
    Tires: Bontrager XR4 2.35 (it's HUGE!) up front, probably a 2.2 XR3/XR4 or Kenda Honey Badger 2.2 rear
    Fork: Sold the 32 F150 and got in on the screaming deal Backcountry had on the F34 150 TALAS 27.5 forks. I'll install the 2014 FIT Trail Adj cartridge over the winter.

    Also ordering a OneUp 42T rear cog, a RaceFace 30T N/W front chainring and a SRAM X9 Type 2 rear D.

    Hoping this bike will roll faster, eat more terrain and be a general trail menace come spring!

  40. #40
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    Let us know how it works. I've been tempted by the 650B Talas's popping up on eBay.

  41. #41
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    Quote Originally Posted by thirdchute View Post
    Let us know how it works. I've been tempted by the 650B Talas's popping up on eBay.
    That's the fork I have. Haven't installed it yet.

    Did a test fit on my rear set up tonight. My LBS only had Bontrager XR3 2.35's in 650b. Comparing to stock bikes, the XR3 2.35 650b isn't as massive as the XR4 2.35, so I figured I'd give it a whirl.

    It rubs just a bit at absolute full compression. (I let all of the air out of the shock and was holding the triangle as far up as it would go.) Left two marks on the seat tube. Probably wouldn't be a problem on the trail.

    The XR3 seemed like a nice tire and I wanted to keep it, but it was an absolute mother to install on my Sun Ringle' Charger Pro SL 27.5 wheelset. I literally started sweating trying to mount the tire... and busted a knuckle trying to get the damn thing off the rim. (Sun Ringle makes Stan's rims and licenses Stan's BST technology, so the tire/rim fit is VERY, VERY tight.)

    I realize now I should've measured the height of the tire, but I can't bare the thought of wrangling the stupid thing back on/off just to get a measurement. lol

  42. #42
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    I forgot I never responded or updated this thread.

    In the process of doing the fit check of my new, Sun Ringle' Charger Pro SL 27.5's... I found a crack on my Roscoe's drive-side chainstay

    Long story short: I now have a 2013 Trek Remedy 9.9 27.5/650b conversion

    http://forums.mtbr.com/27-5-650b/201...l#post11138409

  43. #43
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    Ah, the Roscoe's are notorious for those especially the 2009 models. My 2010 Roscoe III is a replace frame a friend got for a chainstay crack on his 2009.

  44. #44
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    Hey thirdchute, still got your Roscoe frame? I found my old spare derailleur hanger and would like to find it a good home.

    PM me if interested.
    I like 'em low, long, slack and playful

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