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Old 09-09-06, 10:30 PM   #1
willjones4
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Super Clyde Needs Tire Help

I am a very large rider (300 lbs +). I have my tires pumped up to the max (60 PSI) and they still look a little pancakey to me when Im on the bike. Im looking for recommendations for the highest PSI tire I can get in the 26" size. The wider the better. I have searched around on Google for a couple hours and cant seem to find a slick or semi slick rated over 65 PSI. Thanks for any help!
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Old 09-09-06, 11:04 PM   #2
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Before I switched to 1.5" Armadillos, I used 1.95" knobbies on the mtb. I was 270lbs. At the rated 80lbs, they still looked somewhat squashed. I currently run the Armadillos at 90lbs which is 10lbs over rate. I do this because I like the lighter handling of running slightly over, not to avoid the squashing. If you use wider tires, you will usually get alittle more bulging. A Kevlar enhanced tire like Armadillos and other brands will have stiffer characteristics.
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Old 09-09-06, 11:11 PM   #3
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I'm running Bontrager Road Warrior 26x1.5 slicks on my bike. They're rated for 80 psi, and they're pretty darn fast.

I've never seen them on the web, but my LBS just had them in their regular stock.
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Old 09-10-06, 12:17 AM   #4
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You don't say if you are on or offroad, but any tyre will take more than the recommended max. On our tandem- which incidentally is 400lbs all up weight- we Use Fire XC's in 2.1 size and although we run them at 65 normally- On dry conditions they get upped to 75psi. On the slick side, we use Scwalbe Marathons in 1.4 at 110 psi. Either of these tyres have been proved to take in excess of your weight, but there are others around.
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Old 09-10-06, 03:18 AM   #5
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thank you for the replies thus far. I am strictly on road-just had to buy a mtb to hold my weight how much over stated can one usually run tires?
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Old 09-10-06, 04:08 AM   #6
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Before you push the psi. higher get your lbs to tell you if the rims can handle it!!
There is a good chance that your rims are not rated much above your current psi. and it may result in a split rim or sudden failure whilst riding.
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Old 09-10-06, 07:06 AM   #7
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As a pretty heavy rider myself, be wary of high pressure (especially over 100psi) tyres. With higher pressures, you will start to get problems with rims and spokes.
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Old 09-10-06, 02:23 PM   #8
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Originally Posted by damian_
As a pretty heavy rider myself, be wary of high pressure (especially over 100psi) tyres. With higher pressures, you will start to get problems with rims and spokes.
Very good point. I Run disc's on the tandem and have two types of rims- Both Downhill quality by the way. The slicks always go on the Disk specific rims as they have never had a Rim brake rubbing metal away from the Rim. On the few occasions I have had to put slicks on my solo-with rim brakes- I always put the slicks on my best rimmed wheel as I have seen worn rims bowing out under the pressure of 100psi.
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Old 09-10-06, 02:26 PM   #9
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Quote:
Originally Posted by willjones4
thank you for the replies thus far. I am strictly on road-just had to buy a mtb to hold my weight how much over stated can one usually run tires?
I would suggest an extra 10psi if the tyre is rated to 65- 15 if rated at 90 and 20 if rated at 100psi or above. Only thing is- make certain that the tyre is in good condition with no carcase damage and do check the rims. Another point- If using high pressures go to a presta valve.
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Old 09-11-06, 01:59 PM   #10
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A friend of mine is just over 300 lbs and she has MTB slick tires rated to 80 psi. They are kevlar reinforced and don't squish much.

I am not sure where you are looking, but Nashbar has plenty of 65 psi plus tires for MTBs.
http://www.nashbar.com/profile.cfm?c...20to%2026x1.75
http://www.nashbar.com/profile.cfm?c...20to%2026x1.75

http://www.nashbar.com/profile.cfm?c...20to%2026x1.75

http://www.nashbar.com/profile.cfm?c...20to%2026x1.75
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Old 09-11-06, 03:14 PM   #11
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Quote:
Originally Posted by geebee
Before you push the psi. higher get your lbs to tell you if the rims can handle it!!
There is a good chance that your rims are not rated much above your current psi. and it may result in a split rim or sudden failure whilst riding.
yeah, be careful with high-pressure with big tyres. The larger surface area of the casing will end up putting A LOT of stress on the rim itself.

Also tyres are SUPPOSED to compress when you put weight on them. You really want just the minimum pressure needed to prevent complete squashing when you hit a bump or a rock which can lead to pinched flats. So if you're not getting pinched flats at 60psi, then you don't have to worry at all. Although 80psi will have you roll faster. Personally, I like the Tioga City Slickers, kinda like a motorcycle-tyre on a bike. Or the Specialized Nimbus is pretty nice as well. The Specialized FatBoy is a 1.25" narrow slick that can take like 80-90psi and will have your bike roll as fast as a road-bike. But the ride's really harsh at that pressure.
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Old 09-11-06, 03:53 PM   #12
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I weigh 320 and ride Serfa Drifters in the 1.5" width on my Sedona.

Both of the tubes blew out from the additional pressure with my rims at different times (on the inside... probably spoke related). Ironically they each blew out when the bike was sitting in my apartment, and not when I was riding. Ironic and lucky!

This was a little over 2 years ago and I then replaced both tubes with thorn resistant (which are thicker at the tread, but also thicker inside) and I haven't had a flat yet. I suspect the same could have been done with a good rim strip or tape.

There might be better rolling tires, but my Drifters pumped to 80 PSI are proven to withstand 320 pounds on pavement (including 2 metric centuries, and many other rides) and crushed gravel (primarily the Lehigh Gorge Rail Trail). I am not sure how much mileage I have on the tires, but it is well over a thousand, and there is plenty of life left in them.

All this, and they are inexpensive!
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Old 09-12-06, 10:20 AM   #13
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Quote:
Originally Posted by geebee
Before you push the psi. higher get your lbs to tell you if the rims can handle it!!
There is a good chance that your rims are not rated much above your current psi. and it may result in a split rim or sudden failure whilst riding.
This is a very important point that is often overlooked by cyclists and even good bike techs. The rim must be the correct width and type for a given tire, and the rated PSI of the rim should not be exceeded. Most rim makers provide maximum PSI ratings for each of their rims, based on testing with tires of the correct size and type.

Assuming that your rim is rated for 100 PSI, there should be no problem running a tire rated at 90 PSI maximum at 100 PSI. Tire PSI ratings build in a substantial safety margin.

A tire provides its best performance at 15% deflection. For a 300 pound rider, on a given tire, 15% deflection might be obtained at 100 PSI. On that same tire, a 120 pound rider might obtain 15% (a slight visible decrease in the distance between the rim and the pavement when seated on the bike) at just 40 PSI. So, the "best" PSI for a given tire is different for each cyclist.
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Old 09-12-06, 10:34 AM   #14
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I just put on 1.95" Armadillos which I pump up to about 85 psi on my mtb. Nice slickish tread for the road (and it looks like only 1" of it is actually rolling when I go through a puddle) but extra traction on turns and when it gets sandy/muddy. I go through some nasty stuff (glass, nails, tacks, etc...) and it's been able to handle most of it (got one nail that got me on their virgin ride but otherwise fine). Did 80 miles in the NYC Century and they did fine - plenty of glass stuck in them but didn't go through. Definately a bumpier ride then my old knobbies though.

By the way - I'm at 260 so I know what you're talking about. Say hi in the Clydes thread - we're working on creating a separate forum for topics like this. Many of the Clydes in that thread ride road bikes with Mavic Pro wheelsets. I'm slowly becoming a believer...but it'll still be a little while until I get a roadie!
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Old 09-12-06, 02:16 PM   #15
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Get a roadie. It is like another world.

I make my Performance XXXL jersey look like a euro racing cut skin suit. I look good.
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Old 09-12-06, 04:16 PM   #16
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super-clydes unite! 325lbs here. I have ridden 1.25" slicks at 95psi, and right now am on 2.125 slicks at around 70psi (rated for 65). I tend to take sidewall ratings as a suggestion more than anything.
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Old 09-13-06, 07:03 PM   #17
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Started riding at 245 lbs, and ride often with my wife on a tandem with combined weight of over 350 lbs. (I'm down to 220 lbs now.)

I've never had problems with tires running pressures of 40psi to 60 psi, and at the 60 psi level the tires are like rocks. You need some give in the tires for them to work properly, but you don't want them to be so low as to allow pinch flats or other problems.

Gauging the bulge from a riding position is difficult at best. Can you get a friend or another rider to look at your tires and see if they are going too low?

FWIW, I've recently switched to Armadillos due to puncture flats all summer, really like them so far. The extra belts and cord might help you some. Mine are 26x1.90 and are rated up to 80 psi, but I still run them at 55-60 psi, which is plenty firm.

Hope this helps.

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