October Build of the Month - 29er Specialized Stumpjumper
Posted by PeterD Sun, 10 Feb 2008 18:22:00 GMT
This customer brought some parts in for Charles to build up a 29er bike around (and yes, he only brought one derailer in, though I don’t think that is he reason this bike ended up as a 1 by 9).
Charles worked with the customer on spec’ing the rest, aiming to build a solid trail bike for a very fit athlete, with a variety of durable, light weight components that work well and look great together.
The Selle SMP Evolution saddle is pretty unique, and was a special order. Some additional highlights are the transparent chain guard and chainstay guard, 1×9 drive train, and hand built wheels.
| Frame | Specialized Stumpjumper 29, Silver 19”, 08 |
| Fork | Fox F100 RLC 29r 08 Disc |
| Headset | Chris King, 1-1/8” Navy |
| Brake Levers | Magura Marta SL Silver |
| Stem | Ritchey 90×6* Axis 44 Stem, WCS 31.8 |
| Front Brake | Magura Marta-SL Silver, 180m |
| Rear Brake | Magura Marta-SL Silver, 160m |
| Grips | Rocca Locking Grip Blk |
| Shifters | SRAM XO Triggers |
| Rear Derailer | SRAM XO Short Cage |
| Cassette | SRAM 11-34 PG-990 “06 9sp |
| Crank | 175m 32t 1Sp MegaExo V Drv Blk |
| Saddle | Selle SMP Evolution Blue |
| Pedals | Crank Brothers Egg Beater 2 Ti Blk |
| Wheels | Salsa rims w/ King hubs |
| Front Tire | Specialized The Captain 2.0 29r 2Bliss |
| Rear Tire | Specialized Roll X D2 UST |















Ok, I am running a bit behind on posting BOTMs… Sorry about that.
Thats exactly why this bike ended up as a 1×9. I had the vision the entire way, Charles just helped clean my vision up for me.
No chainguide needed?
Nope. The chain stays on the one ring the same way it would stay on any middle chainring on a triple set up.
I’ve got a 1×9 on my salsa hardtail and I do have some chain retention problems… I’m guessing since I don’t have a front derailer the chain doesn’t have a way of realigning when it starts getting really bumpy and pops off. Aside from running a front derailer, do you have any simple chainguide solutions (ie inside and outside ring guards) that don’t require a full-on downhill chainguide? I’ve looked around a bit and haven’t found what I’m looking for yet.
We have set up a couple different things for cyclocross racers using 1×9’s and 1×10’s. Both use a light weight plate on the outside of the chainring, like a Salsa Crossing Guard or Ring Dinger. On the inside you can use either another plate, or a Third Eye Chain Watcher mounted to the seat tube. Both systems are cleaner and quieter than a DH guide. Passion has both in stock if you want see them.
My chain was popping off on big drops but I purchased a third eye chain watcher and hit some of the drops where I would lose my chain and no problem.