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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 08-06-13, 06:00 PM   #1
Bigbandito
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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?
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Old 08-06-13, 06:04 PM   #2
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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
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Old 08-06-13, 06:45 PM   #3
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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.
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Old 08-06-13, 07:30 PM   #4
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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)
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Old 08-06-13, 07:36 PM   #5
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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.
Very well put.
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Old 08-06-13, 07:47 PM   #6
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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.
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Old 08-06-13, 07:52 PM   #7
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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!
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Old 08-06-13, 07:59 PM   #8
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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?
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Old 08-06-13, 08:00 PM   #9
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Nor how fast, far or hard. The point is to have fun on the ride....
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Old 08-06-13, 08:07 PM   #10
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The point is to have fun on the ride....
i (almost) always do. Thanks.
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Old 08-06-13, 08:11 PM   #11
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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.
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Old 08-06-13, 08:26 PM   #12
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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.
90 degrees and about 98% humidity. I'm not sure about the tar seams, but I was sure melting.
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Old 08-06-13, 10:41 PM   #13
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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
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Old 08-07-13, 09:13 AM   #14
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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!
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Old 08-07-13, 09:31 AM   #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.
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Old 08-07-13, 10:00 AM   #16
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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.
How do I identify "tougher" tires? Do they have durability ratings like auto tires?
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Old 08-07-13, 10:18 AM   #17
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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.
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Old 08-07-13, 10:37 AM   #18
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... 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.
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Old 08-07-13, 10:54 AM   #19
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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.
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Old 08-07-13, 11:23 AM   #20
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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.
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Old 08-07-13, 03:55 PM   #21
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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).
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Old 08-07-13, 06:06 PM   #22
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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.
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