I have a theory....now with 650b content

[Grannygrinder]

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I've had a measure of the 29er tyre i've got for this 'experiment'.
External diametre is 740mm, half that is 370mm.
So that plus about 35-40 for the height of the crown itself gives a minimum a-c of 410mm
How much mud clearance between the tyre and the crown is sensible?
I'm thinking a fork of 425 a-c?
What are my options in straight bladed carbon or Aluminium?

 

[letmetalktomark]

Salsa Cromoto.

End of search

 

[Andy R]

Salsa Cromoto.

End of search

Indeed

 

[Grannygrinder]

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Steel, really I do fancy some more carbon

 

[Grannygrinder]

Update

Well, fate dealt her hand in the end
I was a bit nervous about how much a 29" was going to change the geometry, as i've said before.
Dan, our freindly neighbourhood wheel builder, had been on a boat off Greenland until about 2 weeks ago, so the wheel lay unbuilt at his place for a bit.
When he came to build it he discovered CRC had sent a 650b rim instead of a 29" :?
Initially i was annoyed about CRC's cockup, and i sent them an email explaining this but then i realised they had done me a favour
650B is 27.5", so halfway between a 26" and a 29". So i now have some of the benefits of a 29" without loosing any of the benefits of a 26"
Just need a matching Racing Ralph in 26" for the rear now and i'll be more than happy
Thanks Dan