REVIEWS DEALS BIKESHOPS TRAILS

Chumba XCL Full Compression Seat tube Clearance?

1529 Views 9 Replies 5 Participants Last post by agentorangemen, Jun 23, 2009

agentorangemen

Discussion Starter · Jun 13, 2009

Anyone have a Chumba XCL they can test at full compression with a Neo-moto for me? I'm thinking it's a no go from my measurements, but they aren't the easiest things to make...

If anyone is in the Corning / Elmira / Big Flats area of NY and has a 650b with a Neo-moto mounted up, I'd love to try the wheel and see if it fits my frame.

Thanks.

Save

1 - 10 of 10 Posts

doralswheels

· #2 · Jun 18, 2009

I am now building up a Intense spyder 29er with a 650b rear wheel with the tire you wanted to know about. I also have a chumba xlc and when i finish the rear wheel, i will try it with the tire on the rear and let you know.

Save

MMcG

· #3 · Jun 18, 2009

agentorangemen said:
Anyone have a Chumba XCL they can test at full compression with a Neo-moto for me? I'm thinking it's a no go from my measurements, but they aren't the easiest things to make...

If anyone is in the Corning / Elmira / Big Flats area of NY and has a 650b with a Neo-moto mounted up, I'd love to try the wheel and see if it fits my frame.

Thanks.

You are basically in the backyard of Stans - give em a call and pay em a visit - I betcha they gotta have one or two wheels available for testing purposes.

Save

agentorangemen

Discussion Starter · #4 · Jun 18, 2009

Thought about running over to Stan's, but didn't feel ethically it would be the best thing to do. Especially since I have no plans of buying their rims...ever.

Thanks dsorals. I'm going to go with a 26er in the rear for now. I measured 13.5" from a skewer to the seat tube at full compression and don't want to take away from the 5" of travel with a shim to fit a 650b in the rear. Definitely going 650b in the front with a maxle revelation.

Save

doralswheels

· #5 · Jun 19, 2009

I finished my rear wheel, stans 355 (347grams) rim with dt swiss aero lite spokes, chris king iso hub with aluimmun nipples (803 grams bare, no tape, no skewer) then i went tubless with stans tape and valve stem and this new latex i read about and bought ($37 for 1000 cc's) with a neo-moto 2.3 tire (721 grams, too heavy for me, will change later) . I then got out my chumba xlc to answer your question about weather the rear wheel will clear the seat tube. I mounted the 650b wheel and i had about 1 finger (i'm 230lbs.) clearence between the center of the tire and the center of the chain stay/steat tube. I then disconected the rear shock (fox 5.0 air) at the frt and sat the bike on the garage floor and i let the shock extend all the way to were the top tube and the head tube meet and the rear tire just touched the seat tube, so i and saying it will work. I didn't ride it because i didn't have a cassette on the rear wheel, but i think the rear tire will clear the seat tube. I hope this helps you. I now am working on the frt. wheel (same rim, same spokes(wew $3.25 each) chris king frt. hub iso and alloy nipples. I hope to have a 1500gram wheel set when i'm done. This will go on a 2008 intense spyder 29er that will be a spyder 650b. frt fork is fox 29er 120mm. I'll send picture when i get finished.

See less See more

Save

agentorangemen

Discussion Starter · #6 · Jun 19, 2009

Hmm, very very interesting. The way I did it was to let all the air out of the rear shock. Put it on the floor, turn the propedal off, and press down on the seat tube until the shock bottomed out, then measured from a skewer to the seat tube. Actually since I was holding the frame, my GF made the measurement.

The new latex you mentioned, is it that Caffe-latex stuff? If so any comments about viscosity, installation, clean up?

Maybe I will have to go sweet talk Stans into letting me fit a wheel...

Save

Kirk Pacenti

· #7 · Jun 19, 2009

agentorangemen said:
Hmm, very very interesting. The way I did it was to let all the air out of the rear shock. Put it on the floor, turn the propedal off, and press down on the seat tube until the shock bottomed out, then measured from a skewer to the seat tube. Actually since I was holding the frame, my GF made the measurement.

The new latex you mentioned, is it that Caffe-latex stuff? If so any comments about viscosity, installation, clean up?

Maybe I will have to go sweet talk Stans into letting me fit a wheel...

You could also take the 3.5 hr drive from Big Flats to New Paltz and visit Vicious Cycles.
They are way into the 650b thing, just landed a shipment of their new rims (C.O.T.R.) too and are bound to have more than a few 650b wheels around.

Cheers,

KP

Save

doralswheels

· #8 · Jun 19, 2009

I was going to let all the air out (fox dhx 5.0 air) but then i remerbered what i read somewere that you don't want to let all of the air out of a fox dhx 5.0 air shock, so that is y i did it that way. Yes, it was the new caffee latex sealent. It pours like water, but seems to seal just like stans sealent does. I would say, just a little more messy than stans. Got to get back to my front wheel build. Hope this helps.

Save

SSteel

· #9 · Jun 23, 2009

Vf2

agentorangemen said:
Anyone have a Chumba XCL they can test at full compression with a Neo-moto for me?

I put a rear 650b (Neo-Moto) into the back end of a VF2 (which has very similar measurements to the XCL) and I removed the rear shock and allowed the frame to compress until the rear tire hit the seat tube, then measured the remaining i2i. Mathematically, at full compression, the tire hits 15mm too soon. Some rear shock modification would be required.

I will conduct more experiments later...

Save

agentorangemen

Discussion Starter · #10 · Jun 23, 2009

Sounds reasonable based on my measurements. Even if the shock air can volume was decreased to cause the compression damping rate to be more progressive, it could still bottom out during normal trail riding. Not sure about the internal workings of the RP23, but I think I've read on here you can shim the bottom out bumper. I'm against this because I want to maintain 5" of travel, and still plan to go forward with a 650b/26 combination.

Save

1 - 10 of 10 Posts

Top Contributors this Month