Bump in tire on Belgium Plus rims

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Kermithimself
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Joined: Sat Jun 02, 2007 12:48 pm
Location: Denmark

by Kermithimself

Have a 28 mm Conti Gatorskin clincher tire fitted to my Hed Belgium+ rims, but have a weird "bump" in the tire just around the valve hole. I've tried remounting the tire to see if that fixed the problem, but it didn't Any ideas?

I've fitted the tire per HED's instructions - starting opposite of the valve hole.
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dim
Posts: 223
Joined: Fri Oct 13, 2017 11:25 am
Location: Cambridge UK

by dim

Kermithimself wrote:
Wed Apr 04, 2018 9:25 pm
Have a 28 mm Conti Gatorskin clincher tire fitted to my Hed Belgium+ rims, but have a weird "bump" in the tire just around the valve hole. I've tried remounting the tire to see if that fixed the problem, but it didn't Any ideas?

I've fitted the tire per HED's instructions - starting opposite of the valve hole.
swop the rear tyre to the front, and if there is no 'bump' on the tyre (on the rim that you think is the problem), then the fault is with the tyre
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alcatraz
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by alcatraz

That's weird. I always start mounting the tire at the valve stem so that I don't get any kinks there afterwards. The stem makes it harder to "massage" and reseat the tire there if there is a problem.

Also with the tire deflated make sure you push the valve stem into the tire once to allow tire to contact the rim properly.

Also is it possible your inner tube is a bit too long? Sometimes there is a kink with tubes that are a bit too long. What I do is with the valve stem mounted first and the rest of the tube outside the tire I check where the opposite side middle point of the tube is and place that in the tire second. That way the two sides are equally distributed. This also prevents the tube to accumulate a twist at the last portion being mounted.

Another trick is to put a light coat of talcum powder on inside of the tire and outside of the tube. That way they don't stick together in one spot.

Also put a small amount of air in the tube before installing it to have it keep it's shape.

This is what I do...
1. with one side tire bead mounted do a valve stem install (no nut), rest of tube hanging out (check tire directionality)
2. attach pump and give a few pumps
3. find tube middle point and position it in the tire at opposite side exactly
4. go around and let the rest slide into place (use talcum powder if sticky)
5. at valve stem start mounting other tire bead and go around to the opposite side(deflate tube if needed at the last bead portion)
6. push valve stem down fully once
7. check by pinching tire all around that the tube isn't pinched between bead and rim, if it is you need more air pressure installing and/or talcum
8. bring up to ~30% pressure and check that valve stem points straight into the center of the wheel. If not deflate and grab tire+tube in several places and try to move it slightly to straighten the valve stem.
9. bring up to 50-70% pressure and spin the wheel and check for bumps/uneveness.
10. if needed deflate and massage/flex tire at bumpy/uneven places. back to step 9
11. pressure test 100%, check roundness

Other reasons for your problem could be that the tire's kevlar casing is damaged or your wheel is radially out of true.

/a

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Kermithimself
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Location: Denmark

by Kermithimself

dim - that's actually a good idea. Will give it a go.

alcatraz - I usually do the same as you, but the Belgium+ rims are a bit different as they are quite wide, and have a different bead. Hence, it's actually easier to start opposite of the valve to keep the tire in the middle section of the rim where it's the lowest.
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alcatraz
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Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

If the valve was pushed in you shouldn't have a problem to get the bead close to the middle. Hmm...

I'd rather not have those last high twisting forces in the tire going over the rim to be directly over the valve area where the tube is bigger and might catch inside the tire easier and move around.

/a

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