As for the diameter of a 23mm tire, the manufacturers don't even agree on how big to make these, let alone that they would give the right dimensions. The difference between two 23mm tires from different manufacturers can be as large as the difference between a 19mm and 23mm tire from the same manufacturer. And then there's the difference between clincher and tubular. Years ago we measured dozens of tires to find out the diameter, and the reason we developed out rear-entry dropout is that the differences were so big.

As for who sells a rear entry Alu dropout for road with setscrews, I don't know anybody.

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Gerard Vroomen
3T.bike
OPEN cycle

What Gerard is too polite to tell you is that you should buy a P3. Great bike. Rear wheel cutout. Horizontal dropouts. It is available in lots of sizes, so fit shouldn't be a problem.

You may have a good reason for a custom bike, but if it isn't a really good reason, think about the Cervelo.

Sure - Cervelo are nice (cough! cough!, did I say that?) (kidding)



BUT...nothing beats a full custom for soul. Soul is very important in a bike. A custom bike and a handshake with the guy who built it, and knew who the bike was for before the torch was litis very cool. Soul will mean allot to a rider who knows that he is on "his/her" bike. Made just for him.



And...if you really want something special, you can have darn near any advanced machine shop cut you drop outs out of darn near any material you want. I have a buddy who had a local company "water cut" his drop outs. It was an "After hours" deal that took the machine shop about an hour to do - cost him $200.00 for the work, and his initials are in the drop out much like the Litespeed "L" is in theirs. He also had his Social Security number etched into the BB shell as his serial number...that is cool.

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What if the Hokey Pokey is what it is all about?

[reply]Also - any consensus on what nominal outside diameter a 700C X 23 tyre has? (it's not 700mm which is what the michelin website suggests...)

Cheers[/reply]

The bead seat diameter of a 700C rim is 571mm. You'll get pretty close by adding 23mm to 571 to get 594. Why not add 23x2? Well, for one thing the round cross section of the tire will rest partially inside the bead seat, and the deflection of the tire when weighted completes the halving (or pretty close).

As for rear-facing dropouts -- if you're going custom, any builder should be able to cut their own dropouts from plate -- that's what TiCycles did with mine.

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