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Help!! Keep getting flats!

Old 01-31-17, 08:17 PM
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Juancestevez20
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Help!! Keep getting flats!

New to the forum and fairly novice bike rider.

Last Friday I had my rear tube replaced at the local bike shop. That night I had the front go out so I took it back and they replaced the front tube. I put it on he bike rack and when I got home they were both flat. Took it back to the bike shop and they changed the rim tape and replace the tubes again. The following day I went out for a ride and had a slow leak in the rear. Had the rear changed on Monday and this morning the front is flat again!!! The puncture is in different places (sometimes on the inside sometimes on the side). I checked the rim and the tire and can't find anything. I weigh about 210 pounds and I am running 700x28 tires at about 80-85 psi (85 is the max) does anyone know why this is happening. IM going crazy! The only thing I could think of is getting a tire that has a higher max psi to support my weight.
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Old 01-31-17, 08:51 PM
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210 pounds on 80 psi tires shouldn't be an issue, and I'm assuming the tube punctures aren't from getting pinched on the rim. How old are your tires ? Maybe they're getting a little dry rot on the inside and causing the tube puncture ?
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Old 01-31-17, 09:11 PM
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I had a similar problem a few years ago and I fixed it by replacing my rim tape...have you checked the tape?
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Old 01-31-17, 09:12 PM
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Few months back same issue..every ride a flat. Marked the tire and tube with a red marker so once I found the puncture I could match them up and investigate the tire. I ran my finger on the inside, nothing, used a magnifying glass, nothing, used a cotton ball on the inside of the tire hoping something would snag it, nothing. I had an extra roll of rim tape so replaced it, nothing. Three rides, three flats, bought a new tire, problem solved. I admitted defeat and moved on.
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Old 01-31-17, 09:17 PM
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I'd say you got into some thorns and didn't get all the debris out of the tire. Could be a spoke poking through. Might be installer error. Could be you're going crazy, but I'd use that as a last resort...
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Old 01-31-17, 09:26 PM
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Originally Posted by Scooty Puff Jr View Post
210 pounds on 80 psi tires shouldn't be an issue, and I'm assuming the tube punctures aren't from getting pinched on the rim. How old are your tires ? Maybe they're getting a little dry rot on the inside and causing the tube puncture ?
The tires are about 2 years old. They are kenda kwest tires that come stock on the purefix cycles. They look fine inside. The old tube I took off is a bontrager 700x35-44 could that be the issue. That seems a little big
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Old 01-31-17, 09:27 PM
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Originally Posted by Larry77 View Post
I had a similar problem a few years ago and I fixed it by replacing my rim tape...have you checked the tape?
Yes. The bike shop changed the tape after the second set of flats
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Old 01-31-17, 09:28 PM
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Originally Posted by stoplight View Post
Few months back same issue..every ride a flat. Marked the tire and tube with a red marker so once I found the puncture I could match them up and investigate the tire. I ran my finger on the inside, nothing, used a magnifying glass, nothing, used a cotton ball on the inside of the tire hoping something would snag it, nothing. I had an extra roll of rim tape so replaced it, nothing. Three rides, three flats, bought a new tire, problem solved. I admitted defeat and moved on.
I noticed they used a 700x35-44 tube so I am going to put the proper tubes on myself and see if that solves the issue. If not then time for new tires.
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Old 01-31-17, 09:45 PM
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Originally Posted by Juancestevez20 View Post
I noticed they used a 700x35-44 tube so I am going to put the proper tubes on myself and see if that solves the issue. If not then time for new tires.
Oh yeah, those tubes are to big for 28 wide tires, any tube meant for a 35 or smaller should work just fine.
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Old 01-31-17, 09:49 PM
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stoplight's cotton ball technique is a good one, but I would suggest turning the tire inside-out first to put the inner surface of the tire under tension. This will tend to open up any tiny holes where a sharp item like a shard of glass or the tiny steel wire from a tire belt may be hiding.
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Old 01-31-17, 09:58 PM
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I have Kenda Kwests 700x32 and I notice the tread pattern tends to hold small stones. I run tire liners. No flats.
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Old 01-31-17, 10:03 PM
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If the punctures are in different places on the tubes, and happen on both front and rear, that seems to rule out something on the rim or in the tire. Maybe you're just in an area with lots of thorns or tire wires or something. If that's the case you'd want strong puncture resistant tires.

In any case if you keep getting flats try to remember where every puncture is on the tube for further detective work.
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Old 01-31-17, 10:10 PM
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Originally Posted by tyrion View Post
If the punctures are in different places on the tubes, and happen on both front and rear, that seems to rule out something on the rim or in the tire. Maybe you're just in an area with lots of thorns or tire wires or something. If that's the case you'd want strong puncture resistant tires.

In any case if you keep getting flats try to remember where every puncture is on the tube for further detective work.
The issue is that flats happened when the bike was either wasn't ridden at all or it was ridden very minimally and in completely different areas. I am going to thoroughly inspect the tire before installing the new tube but I think the bike shop was using too big a tube
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Old 01-31-17, 10:16 PM
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I can't guess the causes of your first two flats, but I'll speculate that the subsequent flats were caused by deficient work by the bike shop and/or defective tubes sold by them. Maybe find a different shop.
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Old 01-31-17, 10:30 PM
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Originally Posted by Juancestevez20 View Post
I think the bike shop was using too big a tube
If so that's a big mistake on their part.
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Old 01-31-17, 10:44 PM
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Flats seem to run in phases for me. I'll go months without any then have several in a row. I had one on a new front tire on my mountain bike in September, due to a big chunk of glass hidden under leaves. Then another flat on the same tire in December, this time a tiny shard of glass. Then five in one week on the same tire, each due to grass burrs. But I've been riding off road, and some really rough rural roads and chip seal, so it's not unusual to encounter lots of sharp pokey stuff.

I finally swapped to a new tube filled with Slime. Hopefully it'll help with the slow leaks caused by the tiny nicks from grass burrs. If it gets me home without needing to stop to patch the tube, I'll be satisfied. I don't want to use liners on the lighter mountain bike tires. I like the handling now.

I'll keep the oft-patched tube for the errand bike, which wears heavy duty puncture resistant tires and has never had a puncture flat.
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Old 01-31-17, 10:52 PM
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A PureFix? Real narrow, aero rims? If so, I'm willing to bet money that you're getting flats from the tube being forced to expand down into the (very narrow) rim cavity.

You probably won't like the best solution.
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Old 01-31-17, 11:18 PM
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Originally Posted by curbtender View Post
I'd say you got into some thorns and didn't get all the debris out of the tire. Could be a spoke poking through. Might be installer error. Could be you're going crazy, but I'd use that as a last resort...
Originally Posted by tyrion View Post
If the punctures are in different places on the tubes, and happen on both front and rear, that seems to rule out something on the rim or in the tire. Maybe you're just in an area with lots of thorns or tire wires or something. If that's the case you'd want strong puncture resistant tires.

In any case if you keep getting flats try to remember where every puncture is on the tube for further detective work.
I once had a customer have me install new tires for me and immediately took a ride in the park across the street from the shop. He came back about 1/2 hour later with 8 thorns in one tire. I shope that I got them all.

It sounds to me like you have covered all of the typical things that I'd suspect. If I had an old set of tires laying around, I'd give them a try. If the flats stop, and I couldn't find anything in your flat cursed tires, I'd bite the bullet and replace them.
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Old 02-01-17, 08:10 AM
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Originally Posted by Retro Grouch View Post
I once had a customer have me install new tires for me and immediately took a ride in the park across the street from the shop. He came back about 1/2 hour later with 8 thorns in one tire. I shope that I got them all.

It sounds to me like you have covered all of the typical things that I'd suspect. If I had an old set of tires laying around, I'd give them a try. If the flats stop, and I couldn't find anything in your flat cursed tires, I'd bite the bullet and replace them.
I went ahead and ordered the right set of tubes and new tires. I am going to change them myself because I've lost trust in bike shops. It's my first time doing it but it looks pretty simple.
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Old 02-01-17, 10:29 AM
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Originally Posted by stoplight View Post
Few months back same issue..every ride a flat. Marked the tire and tube with a red marker so once I found the puncture I could match them up and investigate the tire. I ran my finger on the inside, nothing, used a magnifying glass, nothing, used a cotton ball on the inside of the tire hoping something would snag it, nothing. I had an extra roll of rim tape so replaced it, nothing. Three rides, three flats, bought a new tire, problem solved. I admitted defeat and moved on.
I had that happen to me too! Drove me nuts. I swapped the tire for a new one and no more issues. Something microscopic was causing it. Normally, I'd save an old tire for boots but I happily threw it in the trash.
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Old 02-01-17, 10:49 AM
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Originally Posted by Juancestevez20 View Post
Took it back to the bike shop and they changed the rim tape and replace the tubes again...
What kind of rim tape or strip did they use?

If it's a rubber strip and you've got a double-wall rim, the strip may be allowing the tube to expand into your spoke holes. Rubber strips are intended for use on single-wall rims.

If you've got cloth rim tape like Velox or Newbaum's, or a plastic strip meant for high-pressure tires, is it wide enough and applied on-center? If it's too narrow or it's not centered, your tube may be expanding into spoke holes and rupturing.
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Old 02-01-17, 01:59 PM
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Originally Posted by Juancestevez20 View Post
I went ahead and ordered the right set of tubes and new tires. I am going to change them myself because I've lost trust in bike shops. It's my first time doing it but it looks pretty simple.
What kind of tires did you get?
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Old 02-01-17, 03:53 PM
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This. Went through it with one of my bikes about six months after installing a new double wall rim. The tube extruded through the thin rim strip in several places. I replaced it with cloth tape (Velox or Nashbar, I had both).

Originally Posted by SkyDog75 View Post
What kind of rim tape or strip did they use?

If it's a rubber strip and you've got a double-wall rim, the strip may be allowing the tube to expand into your spoke holes. Rubber strips are intended for use on single-wall rims.

If you've got cloth rim tape like Velox or Newbaum's, or a plastic strip meant for high-pressure tires, is it wide enough and applied on-center? If it's too narrow or it's not centered, your tube may be expanding into spoke holes and rupturing.
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Old 02-01-17, 04:47 PM
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Originally Posted by stevel610 View Post
What kind of tires did you get?
700x28 thickslicks
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Old 02-04-17, 03:06 PM
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Originally Posted by Juancestevez20 View Post
New to the forum and fairly novice bike rider.

Last Friday I had my rear tube replaced at the local bike shop. That night I had the front go out so I took it back and they replaced the front tube. I put it on he bike rack and when I got home they were both flat. Took it back to the bike shop and they changed the rim tape and replace the tubes again. The following day I went out for a ride and had a slow leak in the rear. Had the rear changed on Monday and this morning the front is flat again!!! The puncture is in different places (sometimes on the inside sometimes on the side). I checked the rim and the tire and can't find anything. I weigh about 210 pounds and I am running 700x28 tires at about 80-85 psi (85 is the max) does anyone know why this is happening. IM going crazy! The only thing I could think of is getting a tire that has a higher max psi to support my weight.
It can be a tiny piece of wire or thorn, etc. and be very hard to see. If all else fails just by a new tire. You can mark the tire with White-Out at the valve core to let you know where to inspect the tire extra well.

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