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General Category >> Rubber Side Down! >> Rear tire tube keeps chafing flat
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Message started by TeamMarlony on 03/11/19 at 20:14:23

Title: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/11/19 at 20:14:23

I have had four flat rear tires due to the tube chafing until there's a slit in the tube within 20,000 miles. I ran stock size k555 Dunlop tire and now a Michelin C2 140/75. I bought the mag wheel that has been recommended on this to get away from a a tube but it looks like those tires are 130/90-16 which would raise the bike almost an inch. That isn't much, but my wife who is 4'10" also rides the bike and we need it as low as we can. I have had 3 different reputable shops install the tire/tube. I am just curious if anyone has any suggestions or insight on the cause? I would like to keep with a high mile tire if possible. Thanks!

Title: Re: Rear tire tube keeps chafing flat
Post by verslagen1 on 03/11/19 at 22:37:25

are you using the recommended tire pressure for the tire?
Can be 90% of the max tire pressure.

Title: Re: Rear tire tube keeps chafing flat
Post by Dave on 03/12/19 at 04:02:00

Going to a 130/90-16 may not raise the bike a full inch.....most likely it will be closer to 1/2 inch taller than the recommended 130/90-15.

If your tube is getting a hole, there must be a rusty spot or some other roughness that is wearing the tube.

Clean the rim, sand any rough spots, and put a coat of paint on anything that isn't shiny chrome.....install a new rim band. You can also get a heavy duty tube that has thicker rubber.

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 06:52:47

72617677686563616A35040 wrote:

are you using the recommended tire pressure for the tire?
Can be 90% of the max tire pressure.

Yeah, I try and check that every couple weeks and keep it at 32 to 34.

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 06:55:35

19222F3829253E38232B26394A0 wrote:

I may try the mag wheel and if it is too tall cut the spring a little. The slits are usually on the middle of a football shape where the tube had folded over on itself. There have been up to three different spots on a single tube after a flat. Only one is bad enough to have the slit, but it has been chafing in a few spots.

Title: Re: Rear tire tube keeps chafing flat
Post by verslagen1 on 03/12/19 at 06:57:25

If the tube is folding over on itself, then it is too big for the tire.

Title: Re: Rear tire tube keeps chafing flat
Post by Gary_in_NJ on 03/12/19 at 07:05:46

As other have said, check for a high spot on the rim and install a new rubber rim guard. Using Talcum power or Baby powder when installing the tube (lots of it) helps with rubbing issues too.

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 07:11:40

That may be the case. Usually I have just trusted the shop. I bought an extra last time (same size as one that chafed) and i remember the tube being in the range of the tire. I'll check that next time though. Thanks.

Title: Re: Rear tire tube keeps chafing flat
Post by Dave on 03/12/19 at 07:47:53

If you are installing a 16" tube in a 15" tire....it is going to be too big!

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 08:06:58

The tube on there now is 15". The tire on the mag wheel would be 16", but would not need a tube.

Title: Re: Rear tire tube keeps chafing flat
Post by Dave on 03/12/19 at 08:11:18

Do the folds go along the tube.....or across the tube?

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 08:16:35

Across, on the outside.

Title: Re: Rear tire tube keeps chafing flat
Post by Dave on 03/12/19 at 09:07:44

7F6E6A66666A79676465720B0 wrote:

Across, on the outside.

That would indicate the OD is too big - too much rubber out there for some reason.

What size tire do you have?

Here is where you can figure out the tube size(s) that will work.
https://www.campusskooters.com/tire-size-conversion-chart

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 09:33:46

The current tire size is 140/75-16. I believe that i have 5.11/5.10-16. There doesn't seem to be an exact conversion, but it's close.

Title: Re: Rear tire tube keeps chafing flat
Post by Dave on 03/12/19 at 10:03:50

I thought you had a 15" tire on there now....not 16".

I didn't realize the chart didn't have any 15" tires/tubes on it.

I am so confused. :-?

Title: Re: Rear tire tube keeps chafing flat
Post by TeamMarlony on 03/12/19 at 10:10:50

It is a 15... sorry. 140/75-15. My bad.