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Weinmann concave rim

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Weinmann concave rim

Old 01-31-19, 06:37 PM
  #76  
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Interesting! So now you inspired me to pull my 700c rim out of the cellar and take a close look. And you're right, the inside of the rim is wider at the bead, narrower at the edge. But the difference is very slight.

I think I'll do some careful measurement of the frame, to decide what is the widest tire it will fit, and then look at the tires available. I have to buy spokes and build a wheel, so the cost of another rim is not the only consideration.

Hmmmm....
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Old 01-31-19, 07:43 PM
  #77  
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my Allez wheelset is built on Weinmann Concaves .... they are very strong rims
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Old 02-01-19, 11:40 AM
  #78  
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Rare is it that I purposely deviate from original, if possible. That said, I love my Legnano and got really lucky last summer, scoring a set of Legnano pantographed Campagnolo high flange hubs. Normally, such a bike, in my stable, would be fitted with tubulars but not this time. Tubulars do offer great ride quality but at a price and the price is high, compared to replacing an inner tube. So. I am building up a st of clinchers for my 1968 Legnano Grand Premio and, needless to say, I am going with the concave Weinmann rims. They are close to my favorite vintage clincher rims, even if they are a bit heavy...




I am doing the wheel swap for two reasons. I love the hubs and rims. More importantly, my intention is to ride the Legnano a lot more from now on...
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Old 04-01-20, 11:12 PM
  #79  
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I have a pair of 700C concave A124's lying around as well as a pair of Weinmann 700C alloy rims from a Raleigh Super Grand Prix. The SGP rims have raised edges and no eyelets. Since the weight of the concave rims has been metioned several times, I weighed them as well as the raised edge rims.

The Weinmann A124's (20mm wide 13.5mm sidewall) weigh 534 grams and the raised edge Weinmann (23.5mm wide 10mm sidewall) weigh 560 grams
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Old 04-02-20, 04:35 AM
  #80  
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Perhaps my memory fails me but are not some of the Weinmann concave rims have a bead edge. There were two widths, in the 700c version, and I remember that one, or both, had the bead grip. Some others, particularly the 27" hoops did not have the bead and, at 90psi, the tire just might blow off.
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Old 04-02-20, 05:17 AM
  #81  
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Back in the say, the sales pitch was" think of an i-beam on its side"
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Old 04-02-20, 06:13 AM
  #82  
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I had a pair on my bike from the 80ís. Large flange Campy hubs too. Good times, good memories. I would still use them if I had them! I remember cleaning them as well. Not really any worse than any other rim to clean, but they did hold the dirt so maybe they did cleaning more often.
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Old 04-02-20, 06:31 AM
  #83  
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Originally Posted by 100bikes View Post
Back in the say, the sales pitch was" think of an i-beam on its side"
Uhmmm.......Most "I" (Wide flange) beams work best when they are NOT on their sides......
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Old 04-02-20, 06:43 AM
  #84  
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Understood. That was the salesman pitch.
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Old 04-02-20, 07:04 AM
  #85  
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Originally Posted by Chombi1 View Post
Uhmmm.......Most "I" (Wide flange) beams work best when they are NOT on their sides......
Tell that to the people in marketing and see how far you get.
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Old 04-02-20, 10:21 AM
  #86  
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I just checked my Weinmann concave 700C rims and the inner surfaces of the sidewalls are tapered top to bottom so that the wire beads are wedged into the rim when inflated. They appear straight but using a pair of calipers reveal about a 1mm difference in wall thickness. The other Weinmanns (not concave and no eyelets) with the shorter sidewalls are completely straight top to bottom.

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Old 08-15-21, 03:54 AM
  #87  
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I know I am one of those newbies who resurrect old threads BUT I have found so much interesting information in old threads about vintage parts I own here that I guess a little bit more knowledge won't kill anyone... That being said, I have a reasonably nice pair of Concave rims laced to Ofmega high flange hubs I intend to use for regular riding during the fall/winter/spring (I live in Sweden). They were built in the 70s and came on a bike I bought from Denmark few years back, but were never used then as I quickly switched to Campagnolo wheels instead. I am currently waiting for new tires as they are still fitted with 1970s Panaracer tires (still in good condition though, for some reason). Once I'm allowed to post pictures and have received the new tires, I will show some details of the rims.
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Old 08-15-21, 04:13 AM
  #88  
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27" weinmann concave on a motobecane grand touring!
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Old 08-15-21, 07:52 AM
  #89  
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I remember this thread, welcome back old friend. About 20 years ago, I had a Moto Grand Touring and blithly mounted some kind (can't remember brand) of folders on it. Rode them for the Summer @ 90# with no problems. But the following Spring, on an 85 degree day in early May, I coasted up to a stop sign and my front detonated with a report like a 45 cal revolver. Cross traffic guy in a convertible visibly jumped and my ears were ringing as I walked to the shoulder to fit a new tube. Good times! Don
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Old 08-15-21, 12:26 PM
  #90  
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This and other reports on that rim led to my first wheel rebuild. It was a heliocomatic hub that had some type of misadventure ripping out some spokes. Being silly, I rebuilt the wheel with a replacement heliocomatic and the concave rim so as to try the bike as stock. Wheel hasn’t been installed or bike gone through yet, but sometime…
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