We believe investments in physical manufacturing facilities, and in-house development ultimately makes the difference in performance and quality. From the pristine, seemingly "robotic" weld beads, long-lasting bearings, perfect frame alignment, and unmatched finish, the CHUMBA bicycle does not have an equal in the industry.

CHUMBA is committed to providing accurate information regarding our products in a user-friendly fashion. We've developed and maintain our online tech center to give you fast access to technical and service-related information. If you don't find the information you're looking for here, don't hesitate to contact us. Your satisfaction with our frames is our top priority. E-mail is our preferred method of communication for tech issues.

E-mail: tech@chumbaracing.com

Does the F5 have chainguide mounts?
The F5 comes standard with a ISCG 03 classic adapter plate to run chainguides.

What is the rear wheel spacing on the F5?
The F5 uses 135 mm rear wheel spacing. The brake adapter takes up 10mm of width - making the total rear spacing 145mm. But for all practical purposes - if you order a 135mm * 12mm rear hub - you should be fine.

Do I need to dish the wheel for the F5?
Yes, the F5 needs to be dished 10mm to the non-drive side because the brake adapter takes up 10mm of rear wheel space. By dishing to 10mm to the non-drive side - the rear wheel becomes centered. Your local bike shop should be able to handle this without issue.

I've broken hardware on my F5, what do I do?
You can e-mail sales@chumbaracing.com with the part numbers taken off of the frame diagram and we will send you instructions on ordering a rebuild kit.

I am getting chainsuck on the F5, how can I fix it?
In almost all instances of reported chainsuck, we found the chain length to be too long. While compressing the rear suspension - make sure you don't have more than 2 chain links anywhere through your travel. By avoiding chain slack - the chain will not get pulled into the swingarm.

How do I install a different sized dogbone on my F5?
Here is a comprehensive how-to: http://forums.mtbr.com/showthread.php?t=499866

The driveside pivot bolt is backing out, what should I do?
Use a 5mm allen wrench to remove the bolt, you will need to check whether this bolt is left-hand threaded or not, if it is, it will be marked on the head of the bolt. If you are having trouble removing the bolt, use a small pocket torch and heat the bolt for approximately 20-30 seconds - be careful not to burn the bearing. Once you have achieved sufficient heat to melt any loctite, remove the bolt. Using rubbing alcohol and a q-tip, thoroughly clean the bolt and threads from any dirt or debris. Once it has dried, apply medium strength loctite on 3-4 of the threads furthest away from the head of the bolt, tighten the bolt, and let it dry overnight.

What type of shock does the XS XCL use?
The XS XCL uses a shorter stroke at 1.5"; because of a unique suspension curve different from other XCL models. We've found less need for pro-pedal and adjustments. The frame will work fine with a RP3, which comes standard, but the RP23 may also available upon request.

ISCG mounts on EVO?
Yes, the EVO comes with ISCG 05 mounts and can run Hammerschmidt. You will need to face the ISCG mounts before installing Hammerschmidt.

I have a warranty issue, how do I handle it?
Contact tech@chumbaracing.com and describe the issue you are facing, and if necessary, you will need to ship the part or frame back to us for a warranty evaluation. If CHUMBA determines a manufacturer defect exists, we will replace the part or frame - or offer a reasonable exchange of equivalent value. The warranty period is 1 year from date of purchase for an original owner. CHUMBA also offers a lifetime crash or damage discount policy, please inquire for more details on the lifetime policy. Although CHUMBA does not provide shipping for warranty evaluation; if a defect is found, CHUMBA will ship the item back free of charge.

I've broken non-CHUMBA components that were on the complete CHUMBA bike I bought, can you warranty it?
CHUMBA usually does not handle warranty issues arising from components manufactured by other companies. These warranty issues are best handled by contacting the company that manufactured the component.

First, inspect your shock for any visible damage or leaks. If you see any warranty issues with your shock, please call the Fox Racing Service Center at 800-Fox-Shox.

Second, set up the appropriate level of sag. Recommend sag on the VF2, XCL, and EVO is 13-15mm from the canister.. Please reference your shock manual for further adjustments. (available at http://www.foxracingshox.com/fox_tech_center).

Third, adjust the propedal knob. It has three settings: (1) light; (2) medium; or (3) firm. Pull the propedal knob out and adjust to the setting you desire.

Fourth, adjust your rebound. Start with about 5 clicks in from counterclockwise, and adjust. Generally, the faster the rebound, the springier the bike will feel, and the slower, a bit more sluggish.