I'm considering replacing the 26" x 24.6mm Crest rims on a 2012 SL-R with 26" x 33mm LB carbon rims. Post  indicates a general rule of thumb for tire balloon dimension change with rim width change is approx. 1/3, which seems reasonable but I cannot confirm with present hardware.
Given a Ground Control 2.3 as shown on the 24.6mm rim in Fig. 1 and using the guideline from Post , chainstay clearance should decrease from 6.3 mm to 4.2 mm, which seems borderline for acceptable clearance. I therefore wonder if anybody can confirm or improve upon this rule of thumb, specifically in the tire-to-chainstay dimension, before trying a set of rims shipped from LB?
Also worth pondering is trying an upgraded 27.5 HD rear triangle on the SL-R with 27.5 LB carbon rims, which could be an interesting combination. With d-bug's observation (Post ) of BB height drop of maybe 1/8" and no HA change, taller 27.5 rims may hit a magic spot of maintaining very similar frame handling with a stiffer triangle and putative 27.5" rollover benefits. However Hans' recent comment (Post ) has merit, that a new triangle + links is expensive enough that perhaps I should just start over (Ripley). Essentially this all falls onto tire clearance as described above, thanks if you have any thoughts on this.
Post : Having trouble choosing rim width...
Post : HD swingarm on a Mojo, here it is.
Post : HD retrofit swing arm for more 650B clearance
Figure 1. 26x2.3 Ground Control on Crest 24.6mm width rim (2012 SL-R).
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