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Top Of Tire Rubbing Bottom Of Brakes

Old 05-29-16, 03:06 PM
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Top Of Tire Rubbing Bottom Of Brakes

I switched to a Continental Grand Prix 4000S II 700 x 28 rear tire on my Raleigh Revenio and on a spot in the tire rotation it is rubbing the bottom of the brake assembly. I did a bit of reading and the GP4000 is known for being taller. Didn't notice that when I was doing all my research to pick a new tire.

I suppose I could cry "How can a 700x28 be made that doesn't fit what I would consider a standard bike?" Or some similar whine from various directions.

I spent a fair amount of time picking out what I thought was a great tire for my bike. I'd like to not have to just throw them out or put them on the shelf to never be used.

So... is there anything I can do about it? Can the brake assembly be raised up a bit to compensate? Another idea is to not fully seat the axle but I've never done that in my life and don't know if that is something that people do.

Any thoughts?

Please and thank-you.
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Old 05-29-16, 03:16 PM
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If it only rubs in one spot, I'd make sure the tire is seated correctly all the way around, and that the wheel doesn't have a "hop" to it.
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Old 05-29-16, 03:48 PM
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Sorry to leave you disillusioned, but a lot of "general purpose" road bikes find 25s a fairly snug fit. And there was a run of Specialized Roubaixs around 2008 that would not clear anybody's 25s. The trend for tight clearances on race bikes really got rolling around the late '80s, and "sport" bikes followed suit a few years later.

All you can do is take Scott's advice an make sure your wheels are round. Failing that, drop back to 25s or 26s.
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Old 05-29-16, 03:57 PM
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Well, if it just barely touches the brake, using the rounded side of a half-round file could take off just a little bit of the brake to make room.
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Old 05-29-16, 04:12 PM
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Well the machinist in me says.....

1. Find out how much "hop" the tire has.
2. Find out how much "hop" the wheel has

Maybe if you do not want to true the wheel (assuming it has some runout)...you can index the tire so the two cancel and it the tire seated on the rim runs more true. Many folks index the tire label at the valve stem, so to begin with I'd move it 180 degrees off, and try that, if no joy try 90 and 270 degrees.

Bill
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Old 05-29-16, 05:07 PM
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Originally Posted by Willbird View Post
Well the machinist in me says.....

1. Find out how much "hop" the tire has.
2. Find out how much "hop" the wheel has

Maybe if you do not want to true the wheel (assuming it has some runout)...you can index the tire so the two cancel and it the tire seated on the rim runs more true. Many folks index the tire label at the valve stem, so to begin with I'd move it 180 degrees off, and try that, if no joy try 90 and 270 degrees.

Bill
Definitely I'd do step 2 first as it's easiest and at least as likely to be the problem. Put a fat cable tie on the seat stay next to the rim, cut it short, run it against the edge of the rim. Spin the tire slowly and see how the rim rises or falls relative to the cable tie. A couple of turns of a spoke wrench might be all it takes. But this problem will likely come back with this fit. It will need to remain well adjusted. I like the filing the brake idea too, if it looks mechanically safe.

Anyway, refer to the first reply.
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Old 05-29-16, 05:52 PM
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Looks like those brakes are low end (no offence intended), so I'd probably file them as suggested above.
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Old 05-29-16, 07:07 PM
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Bite the bullet and buy 26's.
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Old 05-29-16, 07:19 PM
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Will it fit on the front ?
Ask around for suggestions of "small-ish" 28 for the rear.
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Old 05-29-16, 08:03 PM
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Fit a 25mm tire and use a Sharpie to change the "25" to a "28". Andy
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Old 05-29-16, 08:14 PM
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Originally Posted by Andrew R Stewart View Post
Fit a 25mm tire and use a Sharpie to change the "25" to a "28". Andy
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Old 05-29-16, 10:24 PM
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Originally Posted by ThermionicScott View Post
If it only rubs in one spot, I'd make sure the tire is seated correctly all the way around, and that the wheel doesn't have a "hop" to it.
I'll give that a try, thanks for the tip. I did just put the tires on and I'm not exactly "seasoned on it".
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Old 05-29-16, 10:25 PM
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Originally Posted by oldbobcat View Post
Sorry to leave you disillusioned, but a lot of "general purpose" road bikes find 25s a fairly snug fit. And there was a run of Specialized Roubaixs around 2008 that would not clear anybody's 25s. The trend for tight clearances on race bikes really got rolling around the late '80s, and "sport" bikes followed suit a few years later.

All you can do is take Scott's advice an make sure your wheels are round. Failing that, drop back to 25s or 26s.
I'll give that try, thanks for also recommending it. I've had a bike for a while but this is my first go-round and doing anything "non-stock". I'll get smarter, I swear!
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Old 05-29-16, 10:25 PM
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Originally Posted by Shimagnolo View Post
Well, if it just barely touches the brake, using the rounded side of a half-round file could take off just a little bit of the brake to make room.
Hmm... that is a thought. I'll run through the other thoughts first but I may come back to this. Thanks for the thought.
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Old 05-29-16, 10:27 PM
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Originally Posted by Willbird View Post
Well the machinist in me says.....

1. Find out how much "hop" the tire has.
2. Find out how much "hop" the wheel has

Maybe if you do not want to true the wheel (assuming it has some runout)...you can index the tire so the two cancel and it the tire seated on the rim runs more true. Many folks index the tire label at the valve stem, so to begin with I'd move it 180 degrees off, and try that, if no joy try 90 and 270 degrees.

Bill
I do have the label at the valve stem. I'll spin the tire and see if I can tell what is causing the hop, the rim or the tire, and go from there. I've never considered doing what you suggested and is one reason I asked here.

Thanks for the tip!
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Old 05-29-16, 10:28 PM
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Originally Posted by Flinstone View Post
Definitely I'd do step 2 first as it's easiest and at least as likely to be the problem. Put a fat cable tie on the seat stay next to the rim, cut it short, run it against the edge of the rim. Spin the tire slowly and see how the rim rises or falls relative to the cable tie. A couple of turns of a spoke wrench might be all it takes. But this problem will likely come back with this fit. It will need to remain well adjusted. I like the filing the brake idea too, if it looks mechanically safe.

Anyway, refer to the first reply.
I'll do that, good addition to Willbird's suggestion. Thanks for replying.
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Old 05-29-16, 10:29 PM
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Originally Posted by Reynolds View Post
Looks like those brakes are low end (no offence intended), so I'd probably file them as suggested above.
No offense taken! I basically bought the bike for the frame and assumed that over time I'd replace the components. If, after trying all the other things here, I can't resolve it I'd have to either go for a different tire or look into a different brake system to see if that would help.
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Old 05-29-16, 10:30 PM
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Originally Posted by davidad View Post
Bite the bullet and buy 26's.
Obviously I'd rather exhaust the other suggestions but if I have to purchase I'll end up doing that.
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Old 05-29-16, 10:31 PM
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Originally Posted by Homebrew01 View Post
Will it fit on the front ?
Ask around for suggestions of "small-ish" 28 for the rear.
I'll have to try that. Since the front has 25's I'll have to check and see if THEY are also seated correctly. Maybe they aren't and there is extra slop so it isn't noticed. I'll try it. Good suggestion.
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Old 05-29-16, 10:32 PM
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Originally Posted by Andrew R Stewart View Post
Fit a 25mm tire and use a Sharpie to change the "25" to a "28". Andy
If I don't have a sharpie will one of those paint pens work? I have one of those for sure.
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Old 05-30-16, 08:24 AM
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Lots of frames have that problem, so you can only choose certain tires, also not all 700x28 are the same, i found out that hutchinson tires suck and run really narrow, there nitro 700x28 measures 700x26.
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Old 05-30-16, 08:33 AM
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Originally Posted by WonderMonkey View Post
I'll give that a try, thanks for the tip. I did just put the tires on and I'm not exactly "seasoned on it".
Filing off a little bit isn't going to help you very much.

You need a 1/4" clearance all around if you plan to ride it on anything other than the cleanest roads on dry days. I've got 1/8" clearance on my Cervelo P2C where the seat tube is shaped to fit around the rear tire and crap jams in there frequently.

go back to 23s or 25s.
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Old 05-30-16, 09:42 AM
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Originally Posted by jesussierra View Post
Lots of frames have that problem, so you can only choose certain tires, also not all 700x28 are the same, i found out that hutchinson tires suck and run really narrow, there nitro 700x28 measures 700x26.
Expensive lessons to learn! Since mine is only hitting in a certain area I'm hoping that some of the suggestions about the rim needing some attention or the tire needing seated are the cause. However since this issue came up the next time I'm looking for tires I'll keep all this in mind.
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Old 05-30-16, 09:43 AM
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Originally Posted by andr0id View Post
go back to 23s or 25s.
I probably will if working the rim or re-seating the tire doesn't pan out.
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Old 05-30-16, 10:41 AM
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I remember reading that Continental 25s measured most closely to 28s.

I would tell you to go tubeless and forget about it as my Schwalbe One 23s are a great ride. You can get the tubeless in a 25 and sometimes a 28 also.

I know on my Orbea a 25 is as wide as I can run and the Continental 25s were a tighter fit than the Vittoria 25 I ran for a bit.
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