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Dura Ace wheels: The fight against tight tires, and unseated beads?

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Dura Ace wheels: The fight against tight tires, and unseated beads?

Old 11-09-21, 04:12 PM
  #26  
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Originally Posted by the sci guy View Post
It's not rubbing against the underside of the caliper- it's rubbing on the actual part of the frame; the crossbar between the seat stays that the brake mounts on.
Yes, that was my point earlier in post #7 above. These older CAAD racing frames were designed for racy tire. Even fat/heavily threaded 25mm tire are a stretch.
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Old 11-09-21, 04:34 PM
  #27  
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You could run a 25c Pasela in back and 28c in front. When I go large on two of my bikes, I run 38c Paselas in front and 35c in back. 25c in the back of my fix gear and whatever tire happens to be on the front rim (usually 27c but its so old I can no longer red the lable). The style police may show up and haul me away but they haven't yet.
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Old 11-09-21, 06:23 PM
  #28  
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Sometimes its the rim shape, if the well between the beads is to shallow it can be very hard to mount a stiff tire. I had some carbon fiber bead Hutchinson Bulldogs that would not mount on Ritchey Pro DS rims for love nor money but fit fine on the factory wheels of my son's Focus. On the other hand Vittoria tires mounted easily on my RItchey wheels.
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Old 11-09-21, 09:59 PM
  #29  
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Originally Posted by the sci guy View Post
Yeah I'll see how the 700x25s fit on these Mavics - I'm hoping the smaller width lets the tire sit down just enough. It's crazy though because there is plenty of room behind the BB (the chainstays have that cut-out area that looks like it's designed for a nice sized tire). And the front fork is like gimmme alllll your wide tiress!!!!
What width rim do you suggest?
Maybe 18-20mm inner width? I don't want to be reckless in my recommendation.

It does suck that some bike frames have really inconsistent clearance.
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Old 11-12-21, 07:31 AM
  #30  
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So I went to the shop yesterday and they gave me a wider rim to test out the theory and it was still a failure. The 700x28 Pasaleas still rubbed the brake bridge.
So, Iím going to try the 25s when they arrive tomorrow and if they donít work Iím going to try a different tire that maybe has a slightly lower profile/construction.
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Old 11-12-21, 08:46 AM
  #31  
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Iím going to try a different tire that maybe has a slightly lower profile/construction.
Looking for less tread will probably be your only hope. Bicycle tires are essentially a round cross section. So only the rubbery stuff added to the outside of the casing that isn't part of their ISO measurement will add any additional width or height. To some extent, manufactures might fudge their stated ISO width. Though I doubt the difference is ever going to much more if any than a millimeter.

Maybe it's N+1 time.
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Old 11-12-21, 09:05 AM
  #32  
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Originally Posted by Iride01 View Post
Looking for less tread will probably be your only hope. Bicycle tires are essentially a round cross section. So only the rubbery stuff added to the outside of the casing that isn't part of their ISO measurement will add any additional width or height. To some extent, manufactures might fudge their stated ISO width. Though I doubt the difference is ever going to much more if any than a millimeter.

Maybe it's N+1 time.
I suspect that's why a lot of tires fall short in width -- because they're also trying not to exceed the height of a tire of that nominal cross-section.

A starker example that got me thinking along these lines: my studded winter tires are marked "47/50-559", but the casing barely measures 42mm wide at full pressure (and on decently wide rims.) The tread lugs measure about 4mm tall, so if they made the tire a true 47mm wide, it would definitely be too tall. And with knobby tires, you want more clearance around the tread anyway...
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Old 11-12-21, 10:54 AM
  #33  
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Originally Posted by Iride01 View Post

Maybe it's N+1 time.
Can't be. I found this bike for my buddy and we already put ~$500 in parts and accessories into it. So, it's this bike. This was not an issue I was expecting to encounter.
Also, my size version of the frame arrives today, sooo....
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Old 11-12-21, 12:30 PM
  #34  
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OK sent went to another shop where I know one of the managers real well and he has experience with these vintage Cannondale frames and knew exactly what I was talking about - he was like "let me guess, it's hitting the rear brake bridge" lol
He said the 700x25 tires should be fine. His experience has showed that 700x25s work, and you can maybe squeeze a 700x26 if you can find them. He was very familiar with Pasaleas so knew what they looked like and how they're made.

So i feel a little better now. The tires arrive tomorrow so we'll see for sure then!
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Old 11-12-21, 12:35 PM
  #35  
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I'm a little confused on why you thought a wider rim would change the diameter of the inflated tire, cross section yes that increases but not diameter.
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Old 11-12-21, 07:31 PM
  #36  
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Originally Posted by Mr. 66 View Post
I'm a little confused on why you thought a wider rim would change the diameter of the inflated tire, cross section yes that increases but not diameter.
wider rim would push the sides out further allowing the tire to not be as tall.
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Old 11-12-21, 07:32 PM
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Good news! The 700x25s arrived today (early) and I put them on and there is plenty of clearance so we are good to go! Huzzah!

Thanks everyone for all the thoughts on this debacle.
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