Keep Getting Flats on my Trainer...wut?
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  1. #1
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    Keep Getting Flats on my Trainer...wut?

    Wondering if anyone's heard of this.
    I've got a new Bkool Smart Go, and all winter, I've gotten 5 flats.
    I've got a dedicated Vittorria trainer tire and I keep the pressure to the recommended 120psi.
    I put on a new tube and around the 30 min mark of training, it starts to go flat.
    I thought maybe the trainer was generating too much heat on the tire, so I put a small fan right where it makes contact but no luck.
    Had no problems last season with my Cyclopse trainer.

  2. #2
    Rub it............
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    Have you looked at the tube to determine where the hole is?
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  3. #3
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    Quote Originally Posted by frdfandc View Post
    Have you looked at the tube to determine where the hole is?
    Yes. It's always near the valve and on the side. I changed the rim strip with no luck. Everything looks fine wrt the rim, no dings/hops.
    I have an old spare wheel and I'll see what happens with that.

  4. #4
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    I wonder if your pinching the tube when installing the tire. Are you starting at the valve hole or finishing there?
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  5. #5
    RoadBikeReview Member
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    when I was using a wheel on trainer, I used a tube larger then recommended for the tire size so it wasn't stretched as much and never flatted. I was using a continental trainer tire but don't think that was significant, the tube size is the key.
    Gravel Rocks

    Trek Domane
    Niner RLT9 (Gravel Bike)
    Trek Crockett

  6. #6
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    Quote Originally Posted by frdfandc View Post
    I wonder if your pinching the tube when installing the tire. Are you starting at the valve hole or finishing there?
    I usually start/end at the opposite side of the valve.

  7. #7
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    The usual suspects?

    Foreign body embedded in casing. Some FB do not become evident until casing is pressurized. Check casing inside & out. Can you swap tires?

    FB on trainer roller. Wipe roller and adjacent areas for FB.

    Faulty tubes? Sometimes you get a bad batch or the rubber "ages out". I once bought a ton o tubes at a deep discount but noticed they all started to fail at or near the valve after YEARS of storage (under fairly good conditions).

    Heat 2.0? Yeah, heat buildup could cause issues depending on variables. How well does the BKool dissipate heat itself? Defect in rim? Rim strip?

    Lower pressure? 90 psi?

    That will be $50 USD.

  8. #8
    Rub it............
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    Try a different tire for a trainer ride. One ride won't damage the tire. If the tire goes flat again, then you have a batch of bad tubes. If not, then you know it's the trainer tire.
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  9. #9
    gazing from the shadows
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    Quote Originally Posted by jlandry View Post
    Everything looks fine wrt the rim, no dings/hops.
    Are you sure?

    Take a cotton ball and rub it on the inside of rim where the hole shows up. Even a tiny burr will show up with that test. It will "grab" some cotton.

    Don't forget to check the valve hole.

    Do that, try a different tire for a ride. If it's neither of of those, then bad tubes.

    BTW, when checking the tire you should flex the casing. Not turn it inside out, but flex it so the part you are checking has a reverse curve to normal. Embedded things can sometimes be hidden in the rubber, but contact the tube under pressure and riding. Finger, or cotton ball again. The embedded and buried bit is rare, but I've had it happen a couple of times over the decades.
    .
    Stout beers under trees, please.

  10. #10
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    Yep, try a different tire. You wonít hurt it, Iím using an gp4000 taken off on my road bike and I have 1,200 miles on it on the trainer.

  11. #11
    RoadBikeReview Member
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    Akirasho is right. 120 psi is a hell of a lot of tire pressure on a little roller. The tire heats up and the rubber splits at the sides, the weakest part. Air to 90 psi. Lower it down or raise the roller just to the point it doesn't slip. And see what happens!

  12. #12
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    Lots of great info here guys, thanks.
    WRT pressure on the roller, this trainer is not like a Cycleops where you wind the pressure with a knob. It's your body weight that adds the pressure. So the pressure of the tire to the roller depends on the rider's weight. I'm 190 lbs.

    I'll try these suggestions, and let you know.

  13. #13
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    I run the air pressure at 100 psi when I'm on my trainer. I'm 220lbs and not run into any flat issues.
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  14. #14
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    Quote Originally Posted by jlandry View Post
    So the pressure of the tire to the roller depends on the rider's weight. I'm 190 lbs.
    So, just like when you ride outside?
    .
    Stout beers under trees, please.

  15. #15
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    Quote Originally Posted by QuiQuaeQuod View Post
    So, just like when you ride outside?
    I was just clarifying the style of trainer.

  16. #16
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    Quote Originally Posted by jlandry View Post
    I was just clarifying the style of trainer.
    I understand. But your logic is off in terms of why you think you need higher pressure for that style of trainer than you would on the road.
    .
    Stout beers under trees, please.

  17. #17
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    Quote Originally Posted by QuiQuaeQuod View Post
    I understand. But your logic is off in terms of why you think you need higher pressure for that style of trainer than you would on the road.
    Not arguing, just answering your question..
    -The trainer-specific tire states on the sidewall to not go under 100psi and it also indicates to add between 100 and 120psi.
    -WRT the trainer, my logic is that the tire is sitting on a tiny 1.5 inch diameter roller. Yes, body weight is what drives this trainer just like on the road, but on the road there would be a larger contact patch than on this roller.

  18. #18
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    So I haven't looked at the wheel in question yet because, I installed the wheel from my spare bike... same problem. Nothing like getting up at 4:00am only to find a flat tire.
    After reading forums & comments from other Bkool users. It's common for these trainers to get super hot. So much so that people have resorted to putting a fan directly to the roller. (I tried this, it didn't work.)

  19. #19
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    Quote Originally Posted by jlandry View Post
    After reading forums & comments from other Bkool users. It's common for these trainers to get super hot. So much so that people have resorted to putting a fan directly to the roller. (I tried this, it didn't work.)

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