Quick question on tyre sizes...

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GoatBeard

Active Member
I'm going to drop the knobblies off a MTB and get some slick, faster road style tyres. Currently on 26x1.95. Happy to go down to 26x1.50. Doing some tyre shopping, what would the equivilent compatible sizes be? 50-559? Or are those size units only applicable specifically to road or other bike/rim types?

Or could I go down to 1.35 ;-)
 
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GoatBeard

Active Member
 

Threevok

Growing old disgracefully
Location
South Wales

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Wobblers

Euthermic
Location
Minkowski Space
The first number in the tyre size is the tyre width in millimetres, so 50-559 is roughly 1.95 inch width. For 1.5 inch width, look for 38 mm tyres (38-559). I've got an old rigid steel mtb shod with 1.5 inch tyres which cope perfectly well even with the craters masquerading as roads up in Glasgow. You should be fine with 1.5 - and in fact, using a slightly wider tyre means you can run at lower pressure so have a more comfortable ride.
 
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