River Rat Posted February 4, 2015 Share I am thinking of converting my Canondale 26er to a 650b. There seems to be plenty of clearance on the fork but not so much on the rear triangle. Anyone know what radius I need, including tires of course. Also anything else I need to look out for. Thx Link to comment Share on other sites More sharing options...
RABUBI Posted February 4, 2015 Share https://community.bikehub.co.za/topic/147281-considerations-for-converting-a-26-ds-to-275/ Link to comment Share on other sites More sharing options...
popcorn_skollie Posted February 4, 2015 Share all threads that came before this one will tell you the same thing.The best way to do it is to physically put the wheel on with the tyre to check Link to comment Share on other sites More sharing options...
River Rat Posted February 4, 2015 Share Thanks guys I was hoping to do a first pass by simple calculation before I hunt down a 27.5 wheel and tire to test. I guess I'm going to have to assume a 20mm minimum clearance and if it passes go to the actual wheel & tire test. Link to comment Share on other sites More sharing options...
shaper Posted February 4, 2015 Share If you don't have a 27.5 wheel, take the frame to your LBS and ask them to fit one of the wheels to see... easiest way and no mess up with number crunching of wheel diameters, tyre volumes etc River Rat 1 Link to comment Share on other sites More sharing options...
Shebeen Posted February 4, 2015 Share I normally have to speak to my wife first before upgrading any bike stuff costing more than a bunch of roses. But I reckon it's easier to ask for forgiveness than permission. Just do it.. River Rat 1 Link to comment Share on other sites More sharing options...
MrJacques Posted February 4, 2015 Share I'd rather put wider 26" tyres on. Usually when squeezing 27.5" tyres into a 26" frame there is little clearance left and you need to run skinny tyres. Personal preference though. The actual difference between 26 and 27.5 (which 650b isn't really, it's closer to 27". 650a is closer to 27.5) isn't that big anyways. http://www.chrisberkley.com/wp-content/uploads/2014/06/Bicycle-Wheel-Size-Illustration1.gif Dirkitech 1 Link to comment Share on other sites More sharing options...
River Rat Posted February 4, 2015 Share I'd rather put wider 26" tyres on. Usually when squeezing 27.5" tyres into a 26" frame there is little clearance left and you need to run skinny tyres. Personal preference though. The actual difference between 26 and 27.5 (which 650b isn't really, it's closer to 27". 650a is closer to 27.5) isn't that big anyways. http://www.chrisberkley.com/wp-content/uploads/2014/06/Bicycle-Wheel-Size-Illustration1.gifMmm, this makes it only 13mm extra. Now I see why a physical test is crucial. Thanks Link to comment Share on other sites More sharing options...
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