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  1. #1
    I wanna go fast!
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    Slimming down my 05 Rockhopper

    Hey, so, I have a 2005 Rockhopper which came stock with:

    FRAME A1 Premium Aluminum, double-butted front triangle with ORE DT, frame geometry designed for 100mm front travel, reinforced disc mount, externally machined HT, forged alloy drop outs with eyelets and replaceable derailleur hanger

    FORK Manitou Axle Comp, 100mm travel, damped, 28.6mm black nitride coated stanchions, preload adjust, Cr-Mo steerer

    HEADSET 1 1/8” threadless, black steel cups, loose ball bearings with seals

    CRANKSET Truvativ 5-D, forged alloy, capless bolts

    CHAINRINGS 42t Cr-Mo x 32t heat-treated Cr-Mo x 22t heat-treated Cr-Mo, replaceable

    BOTTOM BRACKET Truvativ, 68x118mm, square taper, sealed cartridge bearing with double crank stops

    SADDLE Specialized Body Geometry Sport MTB

    SEAT POST Alloy 30.9mmx350/400mm, micro adjust

    SEAT BINDER Alloy QR, 36mm I.D.

    I've already got a new wheelset on it - Mavic XM819s (24 spoke) laced to XT rim brake only hubs, new handlebar (Easton EA50), shifters (XT), brake levers (Avid SpeedDial Ti), and brakes (Avid SD7), cassette (XT), derailleurs (XT front and back), and stem (Thomson). What else can I do to lighten it up and what reasonable weight can I expect to get it down to? I don't even know what it's at now but it feels heavy.

  2. #2
    Alright, let's ride!
    Reputation: LowCel's Avatar
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    What does your budget look like?

  3. #3
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    The stock specialised saddle and bars are pretty heavy. on my 03 rockhopper the bars weighed About 300grams and close to 400 gms for the seat. A new saddle and bars would be a cheap way to drop a fair few grams.

  4. #4
    mmm
    Reputation: timehoc's Avatar
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    Im in the same boat as you...I have an 05 RH comp disc weighing in at 30lbs stock.

    What tires are you using? Tube tires and stans might be a worthwhile investment. In about a year your powerspline bb will go bad when you upgrade to something like a RF deus crankset you would save about 300 grams right there.

    When I switched my seatpost and seat to a thomson setback and light seat I saved 10ozs there.

    Foam grips are also cheap and save weight.

  5. #5
    I wanna go fast!
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    Quote Originally Posted by timehoc
    Im in the same boat as you...I have an 05 RH comp disc weighing in at 30lbs stock.

    What tires are you using? Tube tires and stans might be a worthwhile investment. In about a year your powerspline bb will go bad when you upgrade to something like a RF deus crankset you would save about 300 grams right there.

    When I switched my seatpost and seat to a thomson setback and light seat I saved 10ozs there.

    Foam grips are also cheap and save weight.
    Yeah, my bottom bracket is already going bad, creaking and making awful noises under torque. I am running Hutchinson Python Tubeless Light tires. I plan on upgrading my seatpost and saddle in the near future. Would the Race Face Deus be a good crankset to upgrade to? I had been looking at the Turbine LP. Budget-wise, I am looking to spend around $250 for a fork, $200 for crankset/bottom bracket, and about $140 at the most for seatpost and saddle combined.

  6. #6
    mmm
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    Quote Originally Posted by AggieXCRacer
    Yeah, my bottom bracket is already going bad, creaking and making awful noises under torque. I am running Hutchinson Python Tubeless Light tires. I plan on upgrading my seatpost and saddle in the near future. Would the Race Face Deus be a good crankset to upgrade to? I had been looking at the Turbine LP. Budget-wise, I am looking to spend around $250 for a fork, $200 for crankset/bottom bracket, and about $140 at the most for seatpost and saddle combined.

    Shop around and you should fine decent deal. ie. I just won a 30.9mmx300mm Thomson seatpost on ebay for $26 bucks.

    Sounds like your BB just might need to be regreased. I had that same problem 10 miles into RH.

    Goodluck.

  7. #7
    I wanna go fast!
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    Quote Originally Posted by timehoc
    Shop around and you should fine decent deal. ie. I just won a 30.9mmx300mm Thomson seatpost on ebay for $26 bucks.

    Sounds like your BB just might need to be regreased. I had that same problem 10 miles into RH.

    Goodluck.
    I'd just as soon replace my crankset and bottom bracket with something lighter and higher quality. Does anyone have any idea how much the 05 Rockhopper HT frame weighs by itself?

    Also, the Turbine LP crankset/BB combo on pricepoint actually weighs 5 grams less than the Deus, but the Deus has the external bearings (also costs $60 more). One question...the spindle length on the BB on my bike is 118mm, but the length of the BB that comes with the Turbine LP combo is 113mm, will that be ok on my bike or will it not fit? Sorry, I don't know much about cranks/bottom brackets.
    Last edited by AggieXCRacer; 10-19-2005 at 01:49 PM.

  8. #8
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    Quote Originally Posted by AggieXCRacer
    I'd just as soon replace my crankset and bottom bracket with something lighter and higher quality. Does anyone have any idea how much the 05 Rockhopper HT frame weighs by itself?

    Also, the Turbine LP crankset/BB combo on pricepoint actually weighs 5 grams less than the Deus, but the Deus has the external bearings (also costs $60 more). One question...the spindle length on the BB on my bike is 118mm, but the length of the BB that comes with the Turbine LP combo is 113mm, will that be ok on my bike or will it not fit? Sorry, I don't know much about cranks/bottom brackets.
    I think that you should probably not make those changes and i speak from experience. I own an 03 rockhopper disc and made alot of the changes that you are thinking about.

    In reality the rockhopper is a lowish end intermediate bike. Therefore the upgrades will help but you are facing an uphill battle. The frame and fork on their own weigh nearly 4 kgs. You would be much better off saving your dosh and then either putting it towards a better hardtail or a dually. I spent nearly three quarters of the cost of the bike on upgrades and wish that i had saved my pennies so that i could upgrade to a better bike.

  9. #9
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    Quote Originally Posted by Gonzo22
    I think that you should probably not make those changes and i speak from experience. I own an 03 rockhopper disc and made alot of the changes that you are thinking about.

    In reality the rockhopper is a lowish end intermediate bike. Therefore the upgrades will help but you are facing an uphill battle. The frame and fork on their own weigh nearly 4 kgs. You would be much better off saving your dosh and then either putting it towards a better hardtail or a dually. I spent nearly three quarters of the cost of the bike on upgrades and wish that i had saved my pennies so that i could upgrade to a better bike.

    I'd say just keep your old parts with the intention of putting them back on the Rockhopper when you find a better frame and fork, or bike. You can still use your nice lightweight parts on another bike and recoup your money by selling your old one. And the buyer will appreciate the fact that there isn't much wear and tear on the replaced parts. There are very few lightweight bikes out there that are even remotely affordable. I think building a bike part by part is your best bet. A functionally similar, complete bike will be more affordable, but it will be heavier by several pounds.

    Seatpost size and headset type could vary from bike to bike, so you could go with more affordable upgrades there. And leave the fork steerer tube long since some headtubes are much taller than others.

  10. #10
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    Quote Originally Posted by kingfurby
    I'd say just keep your old parts with the intention of putting them back on the Rockhopper when you find a better frame and fork, or bike. You can still use your nice lightweight parts on another bike and recoup your money by selling your old one. And the buyer will appreciate the fact that there isn't much wear and tear on the replaced parts. There are very few lightweight bikes out there that are even remotely affordable. I think building a bike part by part is your best bet. A functionally similar, complete bike will be more affordable, but it will be heavier by several pounds.

    Seatpost size and headset type could vary from bike to bike, so you could go with more affordable upgrades there. And leave the fork steerer tube long since some headtubes are much taller than others.
    I agree with this.

    And sorry to be a stick in the mud, but those components that you used as upgrades on your bike, while they are good, solid stuff, they are far from light( eception of the brakes maybe). Your wheels are going to be very heavy, those rims weigh around 500grams, while the hubs are also very very heavy. Actually, i just noticed they are rim brake hubs, so they wouldn't be too heavy, but theres still a decent amount of room for weight savings here!

    Thompson stems a really nice, but far from light, they are around 190grams, which is fairly heavy when you consider a Ritchey WSC or Syntace F99 are around 105grams.

    Is your handlebar a riser bar or Flat?? The EA50 flat bar is an OK weight at 170grams, but the riser is a pig. If you have the riser, consider getting something like a Easton Monkeylite.

    And what has been said above is all good advice.


  11. #11
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    Before you start to save weight...

    AggroXC,
    You need a scale so you know what the stock stuff weighs before you change it out. Cheap way is to get a digital scale for like 25 buck from some place like office depot. Or if you are really cheap just bring your parts to the Post Office and weigh them on their digital scale.

    For some cheap weight savings. What about your tubes??? For like 10 bucks you could save 100-200 grams. Performance Luna Lights are around 100gr each.

    I think you could get a much cheaper wheelset for about $200 from Supergo. RPM Lite Wheelset. Not a bad set of wheels and really light for the price.
    For about $300 from Mike Garcia y9ou could get s really nice custom built set. www.oddsandendos.com
    (Maybe not right now since you said you have new wheels but for future reference.)

    For a fork a Manitou Skareb Elite should be just over 3 pounds which will save you a pound+ from what you have now. Thats a pretty big weight savings and you can get one for about 200 dollars right now.

    For saddle/post combo, Performance has the SDG Ibeam seat and post for $99. There are two different versions and it should cut down on a fair bit of weight from stock stuff.

    Then I would second what the other poster said about your handlebar. If its flatbar than leave it alone. If it is the riser than swap it out for a carbon bar. Easton monkey lights can be had for about 60 bucks and will be a big difference in weight. Plus you cannot forget the bling factor.

    After that I would leave well enough alone. I dont think the cost benefit ratio of crankset is worth it to change. If you upgrade the fork and the saddle/post it should make a noticeable difference and you can move them to the next bike. (Remember not to cut the steer tube too short!) I would not spend too much more on the current ride.

  12. #12
    I wanna go fast!
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    I think I've decided that I'm just going to sell this bike and buy another complete bike. It's just more reasonable to me. What would be a resonable price to ask for my bike?

    05 Rockhopper
    Manitou Axel Comp fork
    XT Front/Rear Derailleurs
    XT Shifters
    Avid SD Ti Levers
    Avid SD 7 Brakes
    Eason EA 50 Handlebar
    Shimano SPD 540 Pedals
    Stock wheelset w/ XT Cassette & Chain

    I was thinking about $600 would be reasonable, since the total paid for all of this stuff comes out to about $850 or so.

  13. #13
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    if you're still thinking about selling, i might know somebody here in town who wants to buy it...

  14. #14
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    Quote Originally Posted by themightyjuntao
    if you're still thinking about selling, i might know somebody here in town who wants to buy it...
    check your PM box

  15. #15
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    that fork...

    is rated at around 5.5 lbs alone. check cambriabike or answer's website. if the fork/frame combo is near 4kg, that means the frame itself is around 3.3 lbs. that's pretty damn good.

    edit: the new axel super is rated at 4.3 lbs, but the comp is a crappier model. i thought i saw it listed at 5.5 lbs, but cambria, jenson, answer's sites are missing the data.

    found it, nashbar's site:
    http://www.nashbar.com/profile.cfm?c...eid=&pagename=

    rated at 6.4 lbs...


    plan a: ditch all your gear and buy a new bike.
    assuming you plan on buying a cheap but light bike like a motobecane for about 1100, you dump your bike at a loss of 250, your outlay is 1350. you'll still need misc build costs and real tires.

    edit: assuming you can get 600 for your used bike.

    alternate plan: keep your stuff, judiciously upgrade.
    buy a used sid or mars fork off ebay or craigslist or swap meet or mtbr classifieds for 50-100 bux. get light kevlar bead tires and light tubes. get a light saddle, performance brand or used for about 30 bux. done. you dump ~3.5 - 4 lbs for less than 200, your total outlay is 1050. your final weight should be in a respectable 25 lb neighborhood (adding the previous savings in wheelset, bars, whatnot).

    from there, piecemeal additional parts like stupid light seatpost, cranks, cassette, xtr rear derailleur, etc. or dont. either way, that frame is nice, specialized rockhoppers of all years are not junk.
    Last edited by drunkle; 11-11-2005 at 03:51 PM. Reason: additional comment, errata

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