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Old 07-10-14, 08:29 AM   #1
Rickalodeon
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Wheel upgrade question

I currently have 27 x 1 1/8 wheels. The rims measure to be approx 25 1/4" (641mm). In a perfect world, I'd swap them for rims that measure more like 650mm to give a bit more to the short reach calipers that I've already installed. If I understand the standards correctly, rims for current 700c wheels measure in at 622mm.

So...the question: Are there modern rims that measure in at 650mm?

Thanks.
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Old 07-10-14, 09:00 AM   #2
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So...the question: Are there modern rims that measure in at 650mm?

Thanks.
No, your ISO 630 (27-1/4) rims are it.
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Old 07-10-14, 09:04 AM   #3
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Right your 27"/630 are the largest except some odd old Raleigh 3 spd.

There are 650 b and c rims but strangely they are smaller.
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Old 07-10-14, 09:09 AM   #4
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No, your ISO 630 (27-1/4) rims are it.
miamijim and Bianchigirll....thanks for your responses. Yeah, I just found some additional info on Sheldon Brown's site. So 700c wheels have a 622mm bead seat diameter. And my 27 inch wheels have a 630mm BSD. So my perfect world would have included a 640mm wheel....which as you indicated doesn't exist.

Thanks again.
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Old 07-10-14, 10:05 AM   #5
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Doesn't make more sense to look for brakes to fit the wheels instead of wheels to fit the brakes? It will probably be much cheaper.
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Old 07-10-14, 10:08 AM   #6
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Nobody ever said bike dimensions had to be rational.
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Old 07-10-14, 12:33 PM   #7
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Doesn't make more sense to look for brakes to fit the wheels instead of wheels to fit the brakes? It will probably be much cheaper.
+1 A lot of vintage frames require medium or long reach brakes. Modern short reach brakes just aren't right for most bikes with 27inch wheels.
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Old 07-10-14, 12:44 PM   #8
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+1 A lot of vintage frames require medium or long reach brakes. Modern short reach brakes just aren't right for most bikes with 27inch wheels.
Unless your modern bike was designed for 700c wheels and long reach brakes, then put on the 27s and short reach brakes. But that would be stupid. That's why I did it.

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Old 07-10-14, 04:35 PM   #9
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I LOL'd
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