Classic & Vintage - ERD for Weinmann 2120 650B rims?

Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.



PDA

View Full Version : ERD for Weinmann 2120 650B rims?

tcpasley
09-22-11, 11:47 AM
Does anyone know the ERD of old Weinmann 2120 650B rims?

I scored a set of 650B wheels off an old Schwinn Mirada, and I'm thinking about rebuilding the rear with a cassette hub. I can't find any reference to the rim specs, and I guess I'll eventually have to measure the ERD myself, but it would be good to have a number to compare to my measurement. And I'd like to avoid removing the original Schwinn 40-584 tires - I can probably still ride them for awhile, but the gum sidewalls are a bit crackly.

Thanks,

tcpasley

Reduce, Reuse, Rebicycle

nfmisso
09-22-11, 12:40 PM
measure.

how do you expect to put the rim on a different hub without removing the tires????
tcpasley
09-22-11, 03:34 PM
measure.

how do you expect to put the rim on a different hub without removing the tires????

I said "thinking about rebuilding". I'd like to spec a hub, DS and non-DS spokes and start looking for bargains while I wear out the original tires. Of course I'd have to take the tires off to replace the hub.

tcpasley

nfmisso
09-26-11, 09:41 AM
If you have a pretty good idea of the nipples on the spokes, you can measure from the center of the axle to the point where the spoke enters the nipple, and add the length of the end of the nipple to its flange.
tcpasley
10-06-11, 12:51 AM
I measured it (circumference around spoke heads /pi). I got about 574mm ERD for the Weinmann 2120 650B rim. With a Tiagra FH-4500 rear hub, the lenni.info/edd/ spoke calculators says I'll need ~276mm spokes DS, ~278mm NDS.

tcpasley

Reduce, Reuse, Rebicycle