Quote:
Originally Posted by mudman
I've got 64/104 bcd, lots of options from mtb triples.
Derailleur is adjustable up and down, yes.
I thought 27.5=650B? I've been out of this for too long
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The REAR derailleur is going to be your problem. When you had a few lengths of chain to accommodate a much bigger chain ring, you've got to do something with that chain at the back. Your rear derailleur may not be able to accommodate the add'l length and you may need one with a longer cage. Try and see.
As far as the tires go - you are actually correct... But the whole thing is about as clear as mud.
The 700c and 650b are old designations where the letter indicates the bead. They went with a standard at some point. 700c is a regular road bike wheel and if you look at the wee wee printing around the bead you will usually see 622mm. The 29er wheels are same size rim (usually wider but same height) as road bike 700c. On a 29er tire, you will also often see in the see wee printing 622. Because they are the SAME. I've got 700c tires mounted on 29er rims. Run and ride perfectly
The 27.5 is the same as 650b (the b indicating the standard that everyone went with). In the wee printing on those tires you will find 584mm. So big print on all these tires is the size that we are MARKETED with - and the wee print visible on most of these tires right at the edges of the bead indicates the true size. Oh and 26" mtb is actually 559mm.
Ok - so blah blah blah - here's the short version. 700c equals 29er - with the mountain bike rims being wider but readily accepting wide 700c "roadie tires." The 27.5 and 650b are the same interchange ideas. Just get a tire with compatible width - the height is easy. Ignore the marketing hype.
OK?
angela