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  1. #1
    Circus bear Bigbandito's Avatar
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    Am I riding on borrowed time?

    So I've been riding my Fuji Cross for the last few months (all on road) and having a great time. I've worked my way up to doing an 11 mile loop each of the past three weekends.

    Tonight I thought I'd go out for a short ride around the neighborhood, so I pumped up the tires and took off. As I left, I looked down at my back tire (for the first time ever) and noticed it looked flat. Went home and checked the pressure and everything looked good.

    The ride went fine, but I noticed a little tendency for the bike to slide around in back. This has probably been the case on every ride, but I just noticed it because I was worried about the back tire.

    The bike wears Kenda 700 x 35 tires with a maximum recommended pressure of 85 lbs. I'm 6'6" and weigh 375. Is this tire going to blow out and put me in the ditch? Can I put more air in than the max. psi? If so, how much?

  2. #2
    Rolling along
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    The sidewall maximum pressure is half the pressure required to blow the tire

    You might get a bit of a larger tire for the rear and of a higher quality (threads per inch) but keep on keep'in on

  3. #3
    Hey Charlie Pedal Faster
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    We are all riding on borrowed time brother- in the long run mortality is always 100%. So ride hard, laugh long and dont drink crappy beer.

    Maybe 100PSI would help too.

  4. #4
    just pedal donalson's Avatar
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    http://www.dorkypantsr.us/bike-tire-...alculator.html

    while not perfect this is a good baseline to start off with... but it does look like you need a bit more pressure or more volume (aka bigger tire)
    mtbr clyd moderator

  5. #5
    Senior Member c_m_shooter's Avatar
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    Quote Originally Posted by starkmojo View Post
    We are all riding on borrowed time brother- in the long run mortality is always 100%. So ride hard, laugh long and dont drink crappy beer.

    Maybe 100PSI would help too.
    Very well put.
    May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view.
    May your mountains rise into and above the clouds. -Edward Abbey

  6. #6
    Senior Member Bill Kapaun's Avatar
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    Just for grins, you might check something else- SPOKES.
    Grab adjacent pairs and squeeze together. Look for obviously loose ones.
    The DS spokes WILL be tighter than the NDS.
    Then you can do a "pluck" test to see if the tone sounds similar between spokes on each side.

    Your spokes may have loosened up giving you additional "squirreliness".

    It appears you have a 32 spoke wheel. At your weight, 36 would be MUCH better.

  7. #7
    Hey Charlie Pedal Faster
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    Oh yes- and congratulations on getting out there and riding! The more you do it, the easier it is to do more!

  8. #8
    Circus bear Bigbandito's Avatar
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    Thanks for your thoughts, ideas, and encouragement. Lots for me to think about and check. I think I'll see how 100psi works.

    So no one gets out alive, eh? No matter how far we ride?

  9. #9
    Hey Charlie Pedal Faster
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    Nor how fast, far or hard. The point is to have fun on the ride....

  10. #10
    Circus bear Bigbandito's Avatar
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    Quote Originally Posted by starkmojo View Post
    The point is to have fun on the ride....
    i (almost) always do. Thanks.

  11. #11
    Allez means go. bengreen79's Avatar
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    Was it hot out? Once in a while I'll hit a tar seam on the road I notice that squirmy feeling.

  12. #12
    Circus bear Bigbandito's Avatar
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    Quote Originally Posted by bengreen79 View Post
    Was it hot out? Once in a while I'll hit a tar seam on the road I notice that squirmy feeling.
    90 degrees and about 98% humidity. I'm not sure about the tar seams, but I was sure melting.

  13. #13
    just pedal donalson's Avatar
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    Quote Originally Posted by Bill Kapaun View Post
    Just for grins, you might check something else- SPOKES.
    Grab adjacent pairs and squeeze together. Look for obviously loose ones.
    The DS spokes WILL be tighter than the NDS.
    Then you can do a "pluck" test to see if the tone sounds similar between spokes on each side.

    Your spokes may have loosened up giving you additional "squirreliness".

    It appears you have a 32 spoke wheel. At your weight, 36 would be MUCH better.
    good point... I had a lower end 28c tire on my first road bike that I thought was a bit squirmy... it was actually that a few spokes where pretty loose
    mtbr clyd moderator

  14. #14
    That guy from the Chi Chitown_Mike's Avatar
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    Quote Originally Posted by starkmojo View Post
    Nor how fast, far or hard. The point is to have fun on the ride....
    You must not ride in big city traffic, you can always out ride death there!
    Looking forward to my winter commuting adventure.....

  15. #15
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    When it's time to replace the rear you might want to go with a tougher tire if most of your riding is on the road.
    Be watchful, stand firm in the faith, act like men, be strong. Let all that you do be done in love.

  16. #16
    Circus bear Bigbandito's Avatar
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    Quote Originally Posted by stevel610 View Post
    When it's time to replace the rear you might want to go with a tougher tire if most of your riding is on the road.
    How do I identify "tougher" tires? Do they have durability ratings like auto tires?

  17. #17
    Senior Member
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    Look here at the Schwalbe site. It's a good start. Others will chime in I'm sure. Google Fu is your friend.
    Be watchful, stand firm in the faith, act like men, be strong. Let all that you do be done in love.

  18. #18
    Senior Member volosong's Avatar
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    Quote Originally Posted by Bigbandito View Post
    ... Is this tire going to blow out and put me in the ditch?
    Just to touch on something that nobody has mentioned yet, (and this is only my opinion)... unless you are doing a high speed descent going around a curve, a rear flat will rarely put you in a ditch. You'll usually slow down pretty quickly and might hear your bare rim on the pavement. If you avoid turns, especially sharp ones, you'll usually be able to stop without endangering yourself.
    Deut 6:5

    ---

    "Ha ha! You fool! You fell victim to one of the classic blunders - The most famous of which is 'never get involved in a land war in Asia'".
    - Vizzini during his "battle of wits" with the Man in Black

  19. #19
    Hey Charlie Pedal Faster
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    Quote Originally Posted by Chitown_Mike View Post
    You must not ride in big city traffic, you can always out ride death there!
    Just biked in Berkley CA this morning.... You aren't out running death, merely delaying the inevitable. Death don't have no mercy in this land the man said, and he wasn't lying.

  20. #20
    Senior Member Black wallnut's Avatar
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    Quote Originally Posted by volosong View Post
    Just to touch on something that nobody has mentioned yet, (and this is only my opinion)... unless you are doing a high speed descent going around a curve, a rear flat will rarely put you in a ditch. You'll usually slow down pretty quickly and might hear your bare rim on the pavement. If you avoid turns, especially sharp ones, you'll usually be able to stop without endangering yourself.
    ^^^^^ Great point and along those same lines is to always put the best tire on the front as a front tire flat at the wrong time can wreck you.


    Mark

  21. #21
    Senior Member
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    Here's a primer on tires from Sheldon Brown (and the rest of the site has everything else you want to know about bicycles).
    Be watchful, stand firm in the faith, act like men, be strong. Let all that you do be done in love.

  22. #22
    Big Boned Biker IAMAMRA's Avatar
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    Ride the same tire as you,started at 440ish and down to 295(as of today), mine have always been the same way in the back. I over-pump mine up to about 100psi.
    www.BigBonedBiker.Wordpress.com

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