Litespeed Classic 650b Conversion

[Leandro Fernandes]

Hello guys, my name is Leandro and I have a one Litespeed Classic 1993. She accept 700x28c and I have a pair of 27,5 wheel (Bontrangner at550), with 20mm internal. I would like to know how max tyre I can use (650b that case). My dream is transform this bike in one touring bike.

Thanks for help

This is my love.

[njh...@gmail.com]

I converted a later model Litespeed road bike to 650B, and the limiting factor on tyre size was the distance between the bowed-in chainstays. 650Bx32 (Grand Bois Cypres or Michelin Megamium) were the largest tyres that would fit, and that gave absolutely minimal clearance (only a couple of millimetres) each side. I eventually put 700c wheels back on the bike, sold it, and had Baum make me a Ti 650B custom that can fit 38mm tyres with mudguards or 42mm without. Here's the Litespeed in 650B trim:

Nick

[Eric Daume]

Will your Bontrager 27.5 wheels even fit this frame? The frame is probably 100/130 QR, and I'm guessing the wheels are through axle.

Eric

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[Leandro Fernandes]

My dream would be to put 650bx38 or 42 on it. But I think 650bx35 would be the most I could get.

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[Max]

You can try making your own version of this tire fit gauge from Rene Herse Cycles: 

https://www.renehersecycles.com/shop/equipment/framebuilding/tire-fit-gauge/ 

… Another way is to measure the distance along the chainstay from the rear dropout to where the tire would sit, and then measure the width between chainstays there. On a 650b wheel, the bead seat diameter (BSD) is 584 mm, which puts the radius at 584/2 = 292 mm. To that you would add half the tire width spec for where the widest part of the tire would end up, so basically you can measure out to:  (584+tire width)/2, and then see how much space you have between chainstays at that point. The space between the chainstays should ideally allow at least about 5 mm on each side, so you end up having to provide 10 mm + Tire Width amount of space there. 

Normally, in my experience, if the maximum 700c tire that a bike will fit is 28 mm, it’ll let you run 30-32 mm tires (true width). Continental, Rivendell, Hutchinson, and Rene Herse offer some tires in those widths, to varying degree of “feel”.

- Max “10 650b conversions down, two more to go?..” in A2  

[ThermionicScott]

5mm of clearance per side is pretty generous!  My 650B conversion has about 2mm at most.  :^D

- Scott in Cedar Rapids

[satanas]

You may be interested in this:

https://www.ticycles.com/retrofit-potato-chip

One of the guys on the IBOB list had this done so IIRC 42s would fit.

Later,

Stephen

[Leandro Fernandes]

Nick and Eric, how are you my friends?

I put the 650bx35 and I think is a maximum tyre size that this bicycle support. In the front I buyed new carbon fork and he's accept 700x32. 650bx35 is easy for him.

The bb stayed close the floor. I need a 165 cranckset I think

I put a new photos and one video with 650b tyre size anda the 27,5 wheel.

Cheers

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Leandro Fernandes Machado
+55 (22) 98157-1727