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Technical & Reference Section => Tech and Restoration => Topic started by: mark 2 on July 29, 2009, 03:38 PM

Title: 20 x 1 3/4 size tyres. Now they don't fit normal rims do they......
Post by: mark 2 on July 29, 2009, 03:38 PM

Just tried some real os chunk Carlise Aggressor tyres on regualr Ukai Speedline rims. Tyres were about 2cm too big. Size on the side says 20 x 1 3/4  , not the usual 1.75.  Knew that when I bought them, should have realised really from having a few mini bikes.  I'm guessing then its some imperial / metric (?)   fractional / decimal  standardisation thing, like skinny tyres being 1 1/8 or 3/8 and them being a bit bigger in circumference than 1.75's etc.

So what bmx rims are they for?  Saying Schwinn on link below

Anyone know much about this stuff?  Stidds........?


Here's some info....


http://sheldonbrown.com/tire-sizing.html


Back to the drawing board....

Title: Re: 20 x 1 3/4 size tyres. Now they don't fit normal rims do they......
Post by: jT Racing on July 30, 2009, 04:53 PM

no.

Title: Re: 20 x 1 3/4 size tyres. Now they don't fit normal rims do they......
Post by: toys19 on July 30, 2009, 09:01 PM

rim size doesnt define wheel diameter, its the rolling dia of the tyre, thats why 1 3/8th rims are actually bigger than normal rims...

Title: Re: 20 x 1 3/4 size tyres. Now they don't fit normal rims do they......
Post by: Jt on July 30, 2009, 09:19 PM

soak em in petrol and put em round the next person who pisses you off's neck...then light them :daumenhoch: