Chinese Carbon MTB > 29+ & 27+
Can 29er MTB frame assembled with 27.5er wheels?
bxcc:
That 256 frame with 27.5+ tires seems like an awesome idea to me. Standard 27.5 tires would mostly likely change it for the worse though.
Oolak:
--- Quote from: bxcc on July 29, 2015, 08:44:27 AM ---That 256 frame with 27.5+ tires seems like an awesome idea to me. Standard 27.5 tires would mostly likely change it for the worse though.
--- End quote ---
So with the 27.5 wheels and 3 inch tyres does anybody know if the bottom bracket height would be about the same as if the frame was outfitted with 29er wheels with standard sized tyres? If so, that's something I'd seriously consider and bet a lot of other guys would too. Peter?
JohnnyNT:
Difference in rim Radius between 650B and 29er is 19mm , you'd have to measure how much higher is 3" tire over standard one, probably around 10mm difference, the rest will be BB height change so around 1cm of it.
Jerryno:
--- Quote from: JohnnyNT on July 29, 2015, 11:36:34 AM ---Difference in rim Radius between 650B and 29er is 19mm , you'd have to measure how much higher is 3" tire over standard one, probably around 10mm difference, the rest will be BB height change so around 1cm of it.
--- End quote ---
The BB height from wheel centers on 29er is usually 15mm lower than on 650B. All the other height measurements would be the same if both frames are equipped with same 650B wheels. So you get the number from frame geometries only, don't need to bring wheels into it.
That means 650B frame with 650B wheels has BB 15mm higher than 29er with 650B wheels. I bet you can get 3 inch tires on both.
JohnnyNT:
From what I understood the actual issue is the real BB height over ground, which is the equal to the radius of wheel with tire minus bb offset. When the rim size is decreased, the way for the BB to stay on the same height over the ground is either to change frame to a one with smaller offset or have tires with higher profile. Obviously, sticking to the same frame makes only latter viable. As mentioned earlier, change of less than 2cm coming form the wheels shouldn't be a big deal and fat tires should alleviate for at least half of the difference .
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