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27.5+ Frame Compatibility Thread. Post your setup!

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#401 ·
Yep. Keep them "optimal". Big enough but not too big. Not enough experience to know where that is but can't imagine needing more than the 6 fattie which was 3 inches
 
#402 ·
mrpepto said:
Does anyone know if On-One Inbred 29 would have enough clearance for 650b+ tires? I`m thinking specifically about 2.8 trailblazers on 50mm rim but maybe could go 35mm if necessary. I`m looking everywhere but can`t find any information.
Click to expand...
Has anyone tried 27.5+ on the On One Inbred 29? Google turns up donuts[emoji20]

Sent from my GT-I9197 using Tapatalk
 
#403 ·
A friend of mine is running a trail blazers on the rear and the specialized ground control on the front on his cannondale scalpel 650b, not sure what rims though.
 
#404 ·
Some of you guys are running such tight clearances ... If you get the slightest buckle in your wheel, or even abit of flex.. its gunna be a bad time.

.... Hate to say it but its getting abit stance nation in here.
 
#407 ·
are there any 27.5+ rims there that have 36h? wtb scraper and derby only come in 32h.

(i just wanted to re-use my existing 36 hopes instead of buying a new set of 32 hope hubs)
 
#418 ·
I am considering converting a 2016 Stumpjumper 29er, but am concerned that BB height will be too low. Has anyone measured the actual BB height after conversion? If the wheel diameter decreases from 29 inches to 28.25 inches for a total loss of .75 inches (19 mm), then the expected drop in BB height would be half of that decrease in diameter (9.5mm), right? Meaning the expected BB height for the Stumpjumper would drop from 336 to 326.5. If that is accurate, does that seem manageable?

Does anyone have thoughts on what the lowest acceptable BB height would be for a 27.5+ conversion, in general, even though different styles and terrain will affect this?
 
#419 ·
makersmike said:
I am considering converting a 2016 Stumpjumper 29er, but am concerned that BB height will be too low. Has anyone measured the actual BB height after conversion? If the wheel diameter decreases from 29 inches to 28.25 inches for a total loss of .75 inches (19 mm), then the expected drop in BB height would be half of that decrease in diameter (9.5mm), right? Meaning the expected BB height for the Stumpjumper would drop from 336 to 326.5. If that is accurate, does that seem manageable?

Does anyone have thoughts on what the lowest acceptable BB height would be for a 27.5+ conversion, in general, even though different styles and terrain will affect this?
Click to expand...
HT or FSR?
 
#420 ·
makersmike said:
I am considering converting a 2016 Stumpjumper 29er, but am concerned that BB height will be too low. Has anyone measured the actual BB height after conversion? If the wheel diameter decreases from 29 inches to 28.25 inches for a total loss of .75 inches (19 mm), then the expected drop in BB height would be half of that decrease in diameter (9.5mm), right? Meaning the expected BB height for the Stumpjumper would drop from 336 to 326.5. If that is accurate, does that seem manageable?

Does anyone have thoughts on what the lowest acceptable BB height would be for a 27.5+ conversion, in general, even though different styles and terrain will affect this?
Click to expand...
Your numbers sound about right for a point-of-comparison, but that's not the whole story. The FSR 6Fattie, which has the same front triangle (and for these purposes an equivalent rear triangle) is listed at 331, but it has a longer fork, so 327 is about right for the FSR 29er.

That said, when you run plus tires at appropriately low tire pressures, you lose more bottom bracket height, even unloaded. (They must have measured with those tires inflated to 30 psi.) When I measured the BB height on the FSR 6fattie with 15psi in the tires, it was closer to 320 than 330.

The 6Fattie has one of the lowest effective bottom brackets of any bike, once the shocks and tires are pre-loaded. (It was ~11 inches when I checked, although the autosag probably runs the rear shock softer than I like.) If you convert a FSR 29er to a 27.5+ with shorter shock and an even smaller wheel than the 6fattie, you're bike will have the lowest BB of all. This could be good for some applications, but know that the finish on the ends of my crank arms was completely gone within an hour of me hitting the trail for the first time. Still, I think that's an adequate trade-off. I'd recommend getting the FSR designed for the plus tires, however, rather than converting a 29er. It's easier to go the other way.
 
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