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Old 03-26-09, 10:03 PM   #1
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And what about 507 mm wheels on a R20?

Yes, for sometime I have been thinking about it, but there is a situation. Tyre selection. I am looking for a 507 mm high pressure multi purpose tyre, lets say at least 85 PSI for the road and lower pressures for dirt path. Any suggestion?
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Old 03-26-09, 10:26 PM   #2
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It looks like Calhoun has a decent selection in the 507 size:
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Old 03-26-09, 11:43 PM   #3
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you're not alone my friend.

after seeing Guy Retreau's Raleigh 520, I pondered day and night about what wheel sizes you could fit (*ahem* JAM) into a raleigh twenty. I came to the conclusion that if you remove the seatstay bridge and the chainstay bridge, you can jam a 700c wheel into there. If not a 700c (622), then almost definitely a 650c (571)

I have not tested this, and I am simply speculating.

However, I do have a second raleigh twenty that I might tinker with after I'm done with my first one.....

Here's his 520, in all its glory.

The thing about 507 wheels is that this size is directed toward the juvenile-mountain bike arena, and as such, I don't think you'll find any "skinny" tires in particular. However, for 520, there's quite a selection.
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Old 03-26-09, 11:51 PM   #4
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Hmmm... I have some vintage 650 racing wheels that came off an Italian Torpado and a 20 that needs some tlc.
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