Posts
49
Joined
5/15/2013
Location
CA
I’m building up a Wilson 29 and looking into what I could do to run 27.5 in back while preserving geometry. I’m aware of the Cascade Components DHX2 mullet eyelet, but it appears to be discontinued. Also, my current shock is a previous-generation Super Deluxe coil (250x75).
What are my options? Are there any extended eyelets for the Super Deluxe out there similar to the Cascade Components one for Fox?
I don't know if they'll give enough extra length assuming 8 mm hardware* but you could look at eccentric eyelet bushings. To lengthen the eye-to-eye they need to be in an unstable configuration which gave me pause when I investigated, and one manufacturer (Offset Bushings) markets them only for shortening the eye-to-eye. However, Burgtec does market them as being able to work in either orientation.
* Some very crude calculations suggest that you'd need to lengthen the shock by around 6.5 mm.
Thanks, yeah I thought about offset bushings but, from what I have read, they tend to eventually work themselves into the short/slacker setting.
I used offset bushings "reversed" when I had a GG that I mulleted to help preserve the geo, and had no issues with them flipping themselves. It's just something to keep an eye on. I only did 1 offset bushing in the front shock mount. My reasoning was that the front shock mount doesn't see really any rotation, but the rear does. If you ran a reversed offset in the rear, that one would definitely tend to flip itself, given how the link rotates around the rear of the shock.
Just adding a bit more info on things I’ve looked into.
Without any corrections, running the 27.5 rear wheel would slacken the head angle by about a degree and lower the bb and shorten reach by about 10 mm each.
I don’t think the offset bushing option is worthwhile. My frame has 8 mm hardware on one end and no reducer on the other (connected to a yoke). For 8 mm hardware, the offset bushings only provide 2 mm of offset, which would only steepen things by about 0.3 degrees.
Another option is to run a Works 1 degree angleset to steepen the head angle. This actually looks viable. In addition to correcting the head angle, it would add about 5 mm of reach and bb height back.
I’m also curious why Cascade Components discontinued the DHX2 eyelet. Was it because of some issue, or was it simply not selling well anymore with purpose-built mixed wheel size bikes being common now?
Post a reply to: Mixed wheel size conversion options