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Slight rubbing of tire on fender a problem?

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Slight rubbing of tire on fender a problem?

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Old 12-07-14, 01:36 AM
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PistolSlap
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Slight rubbing of tire on fender a problem?

I just got new tires, and the first ones the guy gave me were so big they didn't fit in the rear fender. The wheel couldn't even move when pumped up. So I took them back and he gave me smaller ones, and I just put them on, and I discover that there is a tiny bit of rub on the rear fender, just one one spot, like, the wheel will spin contact-free for almost a full rotation, but on one section of the tire about 1.5 inches wide, there is slight rubbing on the fender. I guess these tires are a tiny bit bigger than my last ones. I don't know why there would be rubbing only on one tiny part of the tire, maybe my wheel is slightly out of alignment. Would this slight rubbing cause a problem if I rode like that?
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Old 12-07-14, 03:58 AM
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Well...
It MIGHT not mean anything but a tremendously annoying consistent sound.
Or it might wear through the tire rather rapidly - particularly if it's at the sidewall. It's also possible to chafe right through the fender surprisingly fast.

I wouldn't accept fender rub on my commuter.
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Old 12-07-14, 06:35 AM
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The answer is in your question: Your wheels must be out of true. I don't run fenders/mudguards of any type on my bike, so don't come across similar problems to yourself. Either true the wheel yourself or take it to a mechanic. It sounds like it will be the ONLY fix.
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Old 12-07-14, 06:35 AM
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Are the new tires the same nominal size as the old ones? If not, you should return them for tires of the same size. There is some profile variability among "same size" tires so you might have to go for a different brand. You are correct that if your wheel needs truing that could cause the rubbing; however your old tires did not rub, right? So we should assume that they were properly sized.

Fenders need some clearance to allow debris picked up by the wheel to clear without jamming. Depending on the debris, jamming could lock up the wheel affecting your ability to handle the bike.
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Old 12-07-14, 08:29 AM
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I won't run tire/fender combinations that don't give me decent clearance all around. Extremely tight clearances don't leave any room for mud, rocks, road debris, a wheel coming slightly out of true or a fender stay getting slightly bent. Do you have adjustable fender stays? If so you can usually extend them a few mm to get clearance on the back 2/3 of the fender. Sometimes you can improve centering of the fender by slightly lengthening, bending or straightening one or the other stay. If the tight spot is where the fender passes between the tire and a frame tube/bridge your only option is smaller tires. Even a drop from 35 to 32mm or 28 to 25mm can make a significant difference.

I just put the fenders on my winter bike (gravel mutt in summer) and have about 1/4" (6 mm) clearance. Much less and the winter road grit would grind between the tire and fender.
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Old 12-07-14, 10:11 AM
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Since you didn't have any rub with the original tires, there's no reason to accept it now.

Return the tires (if the dealer hasn't run out of patience) and get tires the same width as the originals.

All this could have been, or can be in the future if you buy tires based on the metric (ERTRO) sizing molded into the tire. This is always expressed as XX-YYY, where the 1st two numbers are the width in millimeters, and the next three the diameter. You have to match the diameter exactly for it to fit the rim, but as you now know there's a range of widths possible.

Note that the width value isn't precise, so various tires all marked the same will vary slightly in actual width.
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Old 12-07-14, 01:17 PM
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IF you only have a rub in one spot, I'd reexamine the tire to rim mounting.
Most tires have a thin mold line that will be visible a couple mm from the rim.
Make sure the tire is seated so that line is concentric to the rim.
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Old 12-07-14, 01:39 PM
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Originally Posted by Bill Kapaun View Post
IF you only have a rub in one spot, I'd reexamine the tire to rim mounting.
Most tires have a thin mold line that will be visible a couple mm from the rim.
Make sure the tire is seated so that line is concentric to the rim.
Yes, it could be poor tire seating, and/or wheel alignment

But

The OP didn't have the problem before buying new tires, and even if he can eliminate rub from seating or alignment, he's still working too close, and the right answer is to use a narrower tire which leaves enough clearance to allow for error.
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Old 12-07-14, 01:40 PM
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Originally Posted by FBinNY View Post

Return the tires (if the dealer hasn't run out of patience) and get tires the same width as the originals.
if the dealer hasn't run out of patience?! It is I who have run out of patience. Changing a tire is a pain in the ass, and I've now done it 8 times for nothing. If a *professional* bike shop can't give me the right tire twice in a row while having the right tire right in front of them for reference, that's it. They got two chances, but this time I'm getting a full refund and going elsewhere.
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Old 12-07-14, 01:49 PM
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Any kind of tire rub means wasted energy, and I have no tolerance for that. Get smaller tires.
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Old 12-07-14, 01:50 PM
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Originally Posted by PistolSlap View Post
if the dealer hasn't run out of patience?! It is I who have run out of patience. Changing a tire is a pain in the ass, and I've now done it 8 times for nothing. If a *professional* bike shop can't give me the right tire twice in a row while having the right tire right in front of them for reference, that's it. They got two chances, but this time I'm getting a full refund and going elsewhere.
I wasn't there and so can't comment on the process, or who's responsible for the issue. There is NO "right" width. There are a number of acceptable widths, so if the dealer didn't see the bike or you didn't specify the width, then the dealer can't be blamed for not being psychic.
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Old 12-07-14, 01:57 PM
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Originally Posted by migrantwing View Post
The answer is in your question: Your wheels must be out of true. I don't run fenders/mudguards of any type on my bike, so don't come across similar problems to yourself. Either true the wheel yourself or take it to a mechanic. It sounds like it will be the ONLY fix.
Many tires aren't perfectly round, so I wouldn't run for a spoke wrench right away. Definitely check the true, though.

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Old 12-07-14, 01:59 PM
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Originally Posted by PistolSlap View Post
if the dealer hasn't run out of patience?! It is I who have run out of patience. Changing a tire is a pain in the ass, and I've now done it 8 times for nothing. If a *professional* bike shop can't give me the right tire twice in a row while having the right tire right in front of them for reference, that's it. They got two chances, but this time I'm getting a full refund and going elsewhere.
I'm sure you're both running out of patience. Bring the bike in to have them get a tire that works, it's the only way to insure fender clearance. Tires with the same size marked on them can vary greatly in actual dimensions.

OR, have the dealer order the EXACT same make/model/year/size of tire.
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Old 12-07-14, 02:02 PM
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Where is the fender rubbing? Fender adjustment could also solve this problem.
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Old 12-07-14, 02:20 PM
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Originally Posted by LesterOfPuppets View Post
Where is the fender rubbing? Fender adjustment could also solve this problem.
unfortunately the fender is rubbing right at the rear brakes, so there is no more room to shift the fender back in that area, since it's pressed right up against the brake mechanism.

Originally Posted by LesterOfPuppets View Post
I'm sure you're both running out of patience. Bring the bike in to have them get a tire that works, it's the only way to insure fender clearance. Tires with the same size marked on them can vary greatly in actual dimensions.
the other reason i want to try elsewhere is because when i brought them back the first time, the guy acted as if I was spoiling his whole day and it was a really big deal. he kept saying sorry and such but it felt passive aggressive, like I was really bothering him by being there. especially when the ones he swapped me cost less than the first ones and I asked for the difference. It was only a dollar and change more, but it was my money and i had a right to it. yet i might as well have been asking him to run naked through downtown, the kind of look he gave me and the attitude he gave me about it. mountain equipment coop is where i usually get my stuff, and they are always friendly and cheerful and dont have a problem with returning stuff. smaller bike shops seem to have a tremendous amount of attitude, at least every place in my city. im tired of the attitude.
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Old 12-07-14, 02:23 PM
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It does suck for them. Can't sell a tire that's been mounted as new, so they'll probably only make a buck from the sale of those now used tires. That's why riding the bike there to get tires put on woulda saved you both a lot of hassle.

What is the bike make/model and what make/model/size were the previous tires?
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Old 12-07-14, 02:39 PM
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Originally Posted by PistolSlap View Post
the other reason i want to try elsewhere is because when i brought them back the first time, the guy acted as if I was spoiling his whole day and it was a really big deal. he kept saying sorry and such but it felt passive aggressive, like I was really bothering him by being there. especially when the ones he swapped me cost less than the first ones and I asked for the difference. It was only a dollar and change more, but it was my money and i had a right to it. yet i might as well have been asking him to run naked through downtown, the kind of look he gave me and the attitude he gave me about it. mountain equipment coop is where i usually get my stuff, and they are always friendly and cheerful and dont have a problem with returning stuff. smaller bike shops seem to have a tremendous amount of attitude, at least every place in my city. im tired of the attitude.
MEC guys don't care if they lose money on a tire. The person helping you out probably doesn't even know if/when they're losing money by taking tires back.
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Old 12-07-14, 03:32 PM
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Originally Posted by LesterOfPuppets View Post
It does suck for them. Can't sell a tire that's been mounted as new, so they'll probably only make a buck from the sale of those now used tires. That's why riding the bike there to get tires put on woulda saved you both a lot of hassle.

What is the bike make/model and what make/model/size were the previous tires?

i had the bike there both times, with the previous tires. and i dont want the previous tires again because they have no puncture protection.
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Old 12-07-14, 03:37 PM
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Must be a pretty tight fit. Shoulda inquired about having them mounted.

Good luck at MEC, I guess.
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Old 12-07-14, 06:15 PM
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Originally Posted by PistolSlap View Post
the wheel will spin contact-free for almost a full rotation, but on one section of the tire about 1.5 inches wide, there is slight rubbing on the fender.
This sounds like either a defective tire,or out of true wheel. If the tires were too wide,there would be a constant rubbing,plus there's a good chance the other wheel would also have rub. I'd have the mechanic take a look at the wheel to see if it's got a bad spot,then try swapping just that tire. I've gotten bad tires before,it happens. They can have manufacturing defects,or get messed up from improper storage.
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Old 12-07-14, 06:18 PM
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Originally Posted by PistolSlap View Post
unfortunately the fender is rubbing right at the rear brakes, so there is no more room to shift the fender back in that area, since it's pressed right up against the brake mechanism.
Hmm...what kind of brakes? Now I'm wondering if there's any chance the brakes could've been knocked off center when you pulled/stalled the wheel and now it's pushing on the fender? Some pics would really help.
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Old 12-07-14, 07:45 PM
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PistolSlap, could you post some specifics:

1. Brand, model, and ISO/ERTRO size of the old tires that you replaced
2. Brand, model, and ISO/ERTRO size of the first set of replacement tires (if you have them)
3. Brand, model, and ISO/ERTRO size of the second set of replacement tires (the ones you have on the bike now)

If you could post this info as well as some pics, it would be much easier for us to provide targeted help.
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