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Discussion Starter #1
does anyone have the specs for urban enduro's inner tubes ?
I can't find them anywhere, not in the manual nor online ...
Thanks...
 

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Rear is a 17" Type "B" with a TR-4 valve
Front is a 18" Type "C" with a TR-4 valve

Try to find the "standard duty" tubes - "heavy duty" is not recommended for street tire applications.
 

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Thanks a lot Tony. When I tried to search on conti site thy have differwnt dimeters like 3.75" or 4" ... Do you know if these were anything related to type B or C ?
 

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Thanks a lot Tony. When I tried to search on conti site thy have differwnt dimeters like 3.75" or 4" ... Do you know if these were anything related to type B or C ?
These are just conversions (to inches from metric).

Example:

A 110/80-18 tire is 110 mm wide (approx 4.4 inches), the height of the tire from the bead to the tread is 80% (called aspect ratio) of the width, so it's approx 88mm tall (3.5 inches) and the wheel is 18 inches in diameter.

Tubes stretch a certain amount and therefore one size tube will fit several different size tires. A tube that says fits 3.25-3.50 X 18 means it will fit tires with a width of 3.25-3.5 inches with a wheel diameter of 18 inches. Tubes have a round cross section, so the aspect ratio of the tire isn't all that important.

I realize its all very confusing, so you would be better served finding a supplier that specifies "Type A, B or C" - which has become a more widely accepted standard.
 
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Have any of you replaced the inner tubes yourself? Is it easy to do? I got a flat this weekend and would like to be able to fix the tube myself in the future of it not too difficult. Also, is it something you could do on a trail?
 

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Not on the Scrambler I haven't, at least not yet. Doing it on a trail would very difficult. The biggest problem will be breaking the tyre bead away from the rim which I doubt if you could do with out some sort of bead breaking tool. If you can get the tube out you could apply as a patch as a temporary fix but a new tube is the only safe and permanent fix. I will be doing away with the tubes when it comes round to replacing the tyres, applying a Outex sealing system.
 

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Not on the Scrambler I haven't, at least not yet. Doing it on a trail would very difficult. The biggest problem will be breaking the tyre bead away from the rim which I doubt if you could do with out some sort of bead breaking tool. If you can get the tube out you could apply as a patch as a temporary fix but a new tube is the only safe and permanent fix. I will be doing away with the tubes when it comes round to replacing the tyres, applying a Outex sealing system.
Thanks for the info. I had a feeling it was going to be a pain to do.
 

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Outex do a sealing kit.
tonyjuliano has done a post on this.
It's about £125.
I'll definitely be doing this when it comes to changing my tyres.
 

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Had a screw through the rear tyre this morning in London. Recovery to Metropolis Vauxhall who didn't have a tube in the right size. October and their first rear puncture. Could be a week for Pirelli to supply. Riding the XT500 to work in the morning. Joy!
 

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If you're on the trail with a puncture and riding with another bike, you can use the sidestand of the other bike to break the bead. Just be sure to place something suitable between the two so you don't damage the sidewall. You'll also need a way of supporting the rim on the ground side ;-)
 

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It doesn't matter. In the end they are just balloons to hold the air in. They will conform to the shape of your tires as long as they largely fit.

The ones pwrofdrm posted will work perfectly.
 
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