Dura Ace wheels: The fight against tight tires, and unseated beads?
11-09-21, 04:12 PM
#26
Senior Member
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.
11-09-21, 04:34 PM
#27
Senior Member
Join Date: Oct 2014
Location: Portland, OR
Posts: 12,902
Bikes: (2) ti TiCycles, 2007 w/ triple and 2011 fixed, 1979 Peter Mooney, ~1983 Trek 420 now fixed and ~1973 Raleigh Carlton Competition gravel grinder
Mentioned: 129 Post(s)
Tagged: 0 Thread(s)
Quoted: 4802 Post(s)
Liked 3,922 Times
in
2,551 Posts
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.
11-09-21, 06:23 PM
#28
Full Member
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.
11-09-21, 09:59 PM
#29
working on my sandal tan
Join Date: Aug 2011
Location: CID
Posts: 22,629
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Mentioned: 98 Post(s)
Tagged: 0 Thread(s)
Quoted: 3871 Post(s)
Liked 2,568 Times
in
1,579 Posts
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?
What width rim do you suggest?
It does suck that some bike frames have really inconsistent clearance.
11-12-21, 07:31 AM
#30
bill nyecycles
Thread Starter
Join Date: Mar 2013
Location: Houston TX
Posts: 3,328
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 789 Post(s)
Liked 350 Times
in
190 Posts
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, I’m going to try the 25s when they arrive tomorrow and if they don’t work I’m going to try a different tire that maybe has a slightly lower profile/construction.
So, I’m going to try the 25s when they arrive tomorrow and if they don’t work I’m going to try a different tire that maybe has a slightly lower profile/construction.
11-12-21, 08:46 AM
#31
I'm good to go!
Join Date: Jul 2017
Location: Mississippi
Posts: 14,982
Bikes: Tarmac Disc Comp Di2 - 2020
Mentioned: 51 Post(s)
Tagged: 0 Thread(s)
Quoted: 6190 Post(s)
Liked 4,806 Times
in
3,315 Posts
I’m going to try a different tire that maybe has a slightly lower profile/construction.
Maybe it's N+1 time.
Likes For Iride01:
11-12-21, 09:05 AM
#32
working on my sandal tan
Join Date: Aug 2011
Location: CID
Posts: 22,629
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Mentioned: 98 Post(s)
Tagged: 0 Thread(s)
Quoted: 3871 Post(s)
Liked 2,568 Times
in
1,579 Posts
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.
Maybe it's N+1 time.
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...
__________________
RUSA #7498
Originally Posted by noglider
People in this forum are not typical.
Last edited by ThermionicScott; 11-12-21 at 11:45 AM.
11-12-21, 10:54 AM
#33
bill nyecycles
Thread Starter
Join Date: Mar 2013
Location: Houston TX
Posts: 3,328
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 789 Post(s)
Liked 350 Times
in
190 Posts
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....
Also, my size version of the frame arrives today, sooo....
Last edited by the sci guy; 11-12-21 at 10:58 AM.
11-12-21, 12:30 PM
#34
bill nyecycles
Thread Starter
Join Date: Mar 2013
Location: Houston TX
Posts: 3,328
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 789 Post(s)
Liked 350 Times
in
190 Posts
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!
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!
11-12-21, 12:35 PM
#35
Senior Member
Join Date: Aug 2015
Posts: 3,292
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1140 Post(s)
Liked 1,736 Times
in
957 Posts
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.
11-12-21, 07:32 PM
#37
bill nyecycles
Thread Starter
Join Date: Mar 2013
Location: Houston TX
Posts: 3,328
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 789 Post(s)
Liked 350 Times
in
190 Posts
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.
Thanks everyone for all the thoughts on this debacle.
Likes For the sci guy:
