Bicycle Mechanics - Wheel sizes other then 700.

I got a huge problem, the frame I bought for my new racer doesnt accept my 622 mm rims. The difference is 6/8 inch so I guess a rim about 1 inch smaller would be perfect. I looked at Sheldon Browns website and saw that there is alot of rim-standards around 580-600 mm. The problem is that he doesnt refer to which of those that are extinct or about to become extinct. I wouldnt want to buy rims, build up a wheel just to discover in one years time that I cant get any tires. What standard should I buy. I have 21 mm tires (or maybe 23 mm) on now, and I cant have any wider, so basically I need a standard that is about 590 mm and can take a 18 mm or 21 mm wide tire. Guess 650A would be a good one?

That is a pretty standard size, trifolk drool over these, and there are a lot of trifolk
out there. It is also popular in the WSD type bikes for the height challenged. Nevertheless the selection in 650 is much less than 700c, but it is still pretty wide from a performance point of view ("racing" performance). Much wider than say 27" or 451 sizes. That is from a road point of view as 650 is standard ATB rim diameter also. Steve

I got a huge problem, the frame I bought for my new racer doesnt accept my 622 mm rims. The difference is 6/8 inch so I guess a rim about 1 inch smaller would be perfect. I looked at Sheldon Browns website and saw that there is alot of rim-standards around 580-600 mm. The problem is that he doesnt refer to which of those that are extinct or about to become extinct. I wouldnt want to buy rims, build up a wheel just to discover in one years time that I cant get any tires. What standard should I buy. I have 21 mm tires (or maybe 23 mm) on now, and I cant have any wider, so basically I need a standard that is about 590 mm and can take a 18 mm or 21 mm wide tire. Guess 650A would be a good one?
650c(571 bead seat diameter) is the standard that is used on current road bikes,and for which tires, rims and wheels are available. www.rivbike.com is also promoting 650B(584 BSD) for which the same is available but harder to find. I don't understand when you say the frame won't take 700c but you have 21mm on now.

Ahh, sorry Sydney for beeing unclear. I have a couple of wheels from my former road bike, and they are 622 mm, with 21 mm tires. And they do not fit in the new frame. Therefore I need something with smaller diameter.

Isn't 650 c a bit to small? Shouldnt I "fill the frame up" with wheels so to say?

Hmm, I might look into what my brakes will handle, long reach Shimano 600. Any comments on that?

And as usual I think AFTER I spoke to you Sydney... of course I need 650 c if my current 622 mm is 6/8 inch to big from hub to rim. That means I need a rim that is 2x6/8 inches smaller... about 584 mm, and with long reach calipers then maybe 650 c will be perfect...

So, the only question still is, my brakes, Shimano 6207(8), will they fit?

And as usual I think AFTER I spoke to you Sydney... of course I need 650 c if my current 622 mm is 6/8 inch to big from hub to rim. That means I need a rim that is 2x6/8 inches smaller... about 584 mm, and with long reach calipers then maybe 650 c will be perfect...

So, the only question still is, my brakes, Shimano 6207(8), will they fit?Unless you have some specific reason to need a frame built around 650 wheels, why not cut your losses, ditch it and start over? Frames tend to be designed around a specific wheel size and sticking just something in there may not fly.

I am trying now to find out what this frame was built for, and it seems like it was built for 650 wheels. The problem was that I had my old wheels from a old bike and I thought I could use them until I tried today. So now I am just trying to figure out what the new frame was built for.