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Mr. Tuffy thumping?

Old 11-03-06, 04:50 PM
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Mr. Tuffy thumping?

I've looked at a bunch of threads but haven't found if anyone else experiences this. This morning was my first commute with Mr. Tuffy liners in my 700x25 Continental Ultrasports. I normally commute a few times a week for 13 miles one way. I felt this constant thumping in the tire, like I was constantly going over a bump or crack. Is this normal with Mr. Tuffy? Did I mess up the install? I did add some duct tape around the overlapping edge to keep it from cutting my tube, so maybe that's the culprit. I dunno. Any help, would be appreciated, thanks.
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Old 11-03-06, 05:07 PM
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It's probably just the overlapping edge itself causing the thump. My main commuter bike has a slight ding in the rear wheel that gives the same effect - and it's just about noticable if one spins the wheel and watches carefully.

Incidentally, what prompted you to try the tyre liners? I commute about 18 miles each way and save for the fact that my rear tyre is getting a bit worn (could have been a contributing factor in last night's flat) I have minimal problems Tyres are 700x23 Conti sport 1000.

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Old 11-03-06, 05:14 PM
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The duct tape on the liner is bad. The directions specifically say to not tape the liner. It may be causing the liner to flex & "bounce" as the tire rolls, depending on the tire psi. I've run Mr. Tuffy's for 4 weeks now (350+ miles) without any problems, running in some basic Cheng-Shin $10 tires, and haven't had any thumping nor any flats since I've installed them. I was prompted by getting a flat on my first ride to work, and I haven't had another one since (knock on wood!). In summary, try untaping the liner and giving it a shot.
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Old 11-03-06, 06:42 PM
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Thanks, I'll try removing the tape and smoothing the edges on the liner to prevent it from cutting the tube instead. I got the liners, because on the last few miles of my ride, the road always has alot of debris - broken glass, nails, rocks, wires... I've always been concerned about it, and finally got a flat earlier this week. I figured that I might as well try out tire liners and see if they work. If they work, great; if not, they were only $14, so not too big of a loss. I've wasted more money on worse ideas.
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Old 11-03-06, 06:50 PM
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^^^Fair point!
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Old 11-04-06, 01:07 PM
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I've had Mr. Tuffy's on my mountain bike and haven't had a flat in 6 or 7 years. I don't know how many I would've had without them as a control but I know I've plucked a lot of thorns and goatheads out of the tire.

I think they'll work out for you. Their website says to not tape because the liner needs to move and shift a bit. Also says don't cut because they changed how it's manufactured and it won't abrade your tube. FWIW, I put mine in without cutting and haven't changed/patched a tube since.
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Old 11-04-06, 04:49 PM
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Originally Posted by candybottom
I've had Mr. Tuffy's on my mountain bike and haven't had a flat in 6 or 7 years. I don't know how many I would've had without them as a control but I know I've plucked a lot of thorns and goatheads out of the tire.

I think they'll work out for you. Their website says to not tape because the liner needs to move and shift a bit. Also says don't cut because they changed how it's manufactured and it won't abrade your tube. FWIW, I put mine in without cutting and haven't changed/patched a tube since.

+1
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Old 11-04-06, 07:06 PM
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I put mine in, no cutting, no tape. It just overlaps about 6-8".
I also only run one in the back tire, never get front flats.

I'd like to say the one in the back is due to frugal spending and getting twice the life from a single purchase....but its due to hitting a curb on a high speed 70+kph downhill descent, and doing 360's in the air with my bike. The front tire hitting the curb exploded my tire, rim, and shredded my mrtuffy liner
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Old 11-04-06, 07:09 PM
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Yes, don't cut the liners. You'll never achieve a smooth enough edge and they work well as intended right out of the box. I put 20" ones on my 18" trike tires and even though they wrap around 1 and 1/2 times I resisted the urge to cut them down. I have had no problems at all, and no flats.
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Old 11-05-06, 01:19 AM
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Sounds kind of strange to me, I cut mines and use duct tape with no problems; I've had mines for 5 years now and not one flat or bumpiness to mention. I also rubber cement mines onto the tire too.
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Old 11-05-06, 08:12 PM
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Mt. Tuffy's are great, I love mine.

No need to tape them, just install carefully and they work fine.
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Old 11-05-06, 10:48 PM
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I also cut the overlap because that bump will distort the wheel on long a long downhill. In fact, I cut it and smooth out the rough edge to where it barely overlaps.
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Old 11-06-06, 12:43 AM
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I've used Tuffy's for about 15 years, problem free. I don't cut the sharp ends, but rather heat them them with a lighter and then smooth them out with my fingers. I hope this helps.
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Old 11-06-06, 10:15 AM
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If the flap is not flat, you will get thumping. You will need to trim that extra down to about a 1" overlap. Otherwise, the tube can wear out at that spot. The instructions on the package usually explain that better than I do.

The liners are somewhat older and clumsy technology. Now you can get tires with the Kevelar strip already in the tire. That makes for a smoother ride also.
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Old 11-06-06, 01:39 PM
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I took off the tape, and rode into work today. The thumping is gone. Now I'm just on the lookout for tube wear where the liner overlaps. Guess I'll take a look in a few weeks if all goes well. I may try melting the edges and smoothing them out if I have to. Thanks everyone!
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Old 11-06-06, 01:59 PM
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In 8 years of urban/suburban road riding I've only had one instance were I could positively identify tire liner rub as the cause of a tube failure. Normally as the tread wears thin or the casing gets ready to start falling apart there'll be a blowout from a casing cut prompting a tube/tire replacement.

One benefit of the tuffy's is you've also got a make shift tire boot already installed if you've got a casing cut while on the road, replace the tube and shift the tireliner over the rip, that should get you home.
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Old 11-06-06, 03:39 PM
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I fitted Mr Tuffys to tyres on my bike for a 1997 crossing of the Nullarbor Plain, country where double-g thorns (goat head equivalents) are rampant. I cut the strips to fit, one end concave, the other convex to butt together, then a short length of duct tape to keep them together. They worked perfectly, and I wore out the rear tyre before it ever flatted. To me, the duct tape provides a continuing surface over the join; the join can expand and contract, but there is no edge abrasion on the tube.

Neither Mr Tuffys nor Kevlar strips are a total solution to punctures -- they do not prevent sidewall penetration, nor pinchflats.
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