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  1. #1
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    Question about tires for an old mountain bike used for commuting.

    First off, I"m an uber clyde @ 390 lbs and I'm converting an old trek 850 mountain bike for riding on asphalt / concrete. I've read many threads that suggest changing the mountain bike tires to HIGH PRESSURE SLICKS. The question is, at my weight, what tire pressure is considered high for a 26 inch wheel? Some suggest skinny high pressure tires such as 1.5 width, again will this do at my weight. Any input would be greatly appreciated.

  2. #2
    Senior Member gyozadude's Avatar
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    At your size, about 250 lbs will be on the rear wheel. At 1.5 inches and 60- 70 psi (the max on most 1.5 inch clincher slicks), you'll need about 3.5 sq. inches or so of contact surface on the ground to support your weight. This shouldn't present too much of a deflection on the casing if you pump to 70 psi.

    You could go with wider. For example, the IRS Metro Advantage Pro inverted tread for street riding in 1.9 inch width. That holds up to 65psi max. You'd have less than 4 sq. in. in contact, but over a nearly 2 inch width tire. It would be comfortable and hold up great and provide width and support for your weight.
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  3. #3
    Have bike, will travel Barrettscv's Avatar
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    Schwalbe makes a 26x2.0 touring tire for tandems, consider the Schwalbe Marathon Durume Tandem: http://www.schwalbetires.com/bike_ti..._dureme_tandem

    The tire is rated for 145kg or 320 lbs.

    http://www.amazon.com/Schwalbe-Marat.../dp/B0071TXGO0

    You might just need the tandem tire on the rear, the regular Dureme can be used on the front: http://www.amazon.com/Schwalbe-Marat.../dp/B00516D67C
    Last edited by Barrettscv; 12-20-12 at 08:20 AM.
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