Guest Posted November 2, 2016 Share Posted November 2, 2016 OK so why are the rims in inches when everything else on the bike is metricMy speedo reads in miles an hour Quote Link to comment Share on other sites More sharing options...
CrusaderPhil Posted November 2, 2016 Author Share Posted November 2, 2016 OK so why are the rims in inches when everything else on the bike is metricMy speedo reads in miles an hour Ah! that might explain it, inches are a fraction of mile and the distance for one revolution i.e. the circumference would also be a proportion of a mile but then the profile which on a 160/60 is 60% of 160mm so that blows that theory out of the water. Quote Link to comment Share on other sites More sharing options...
CrusaderPhil Posted November 2, 2016 Author Share Posted November 2, 2016 OK so why are the rims in inches when everything else on the bike is metricMy speedo reads in miles an hour Ah! that might explain it, inches are a fraction of mile and the distance for one revolution i.e. the circumference would also be a proportion of a mile but then the profile which on a 160/60 is 60% of 160mm blows that theory out of the water. Quote Link to comment Share on other sites More sharing options...
someone Posted November 3, 2016 Share Posted November 3, 2016 OK so why are the rims in inches when everything else on the bike is metric For the reason I said in the post you quoted.Changing wheel sizes causes a lot of hassle and cost that is just not worth it. You cannot simply switch an 18" wheel (457.2mm) for a 450mm or 460mm one without other changes to a bike's design. And introducing whole new rim sizes would also mean needing whole new range of tyres for them, as none would previously exist. It is just not worth changing just for the sake of it.But tyres do not have to be so exact. My rear wheel takes an 3.50x16 (imperial) or 100/90 16 (metric) tyre. But a 3.50" width is 88.9mm, and an 100mm width is 3.94". Quote Link to comment Share on other sites More sharing options...
TimR Posted November 3, 2016 Share Posted November 3, 2016 And why is it ..virtually all hgvs over 10ft high have their height recorded in cab in feet and inches... All bridges in the uk are marked out in feet and inches (some with metric also) BUT virtually all garage forecourt canopies are marked in metres ..... ... Quote Link to comment Share on other sites More sharing options...
CrusaderPhil Posted November 3, 2016 Author Share Posted November 3, 2016 OK so why are the rims in inches when everything else on the bike is metric For the reason I said in the post you quoted.Changing wheel sizes causes a lot of hassle and cost that is just not worth it. You cannot simply switch an 18" wheel (457.2mm) for a 450mm or 460mm one without other changes to a bike's design. And introducing whole new rim sizes would also mean needing whole new range of tyres for them, as none would previously exist. It is just not worth changing just for the sake of it.But tyres do not have to be so exact. My rear wheel takes an 3.50x16 (imperial) or 100/90 16 (metric) tyre. But a 3.50" width is 88.9mm, and an 100mm width is 3.94". My wheels are supposed to be 17" but they are not. Quote Link to comment Share on other sites More sharing options...
Guest Posted November 3, 2016 Share Posted November 3, 2016 My wheels are supposed to be 17" but they are not.are they 19" then? Quote Link to comment Share on other sites More sharing options...
JRH Posted November 3, 2016 Share Posted November 3, 2016 And why is it ..virtually all hgvs over 10ft high have their height recorded in cab in feet and inches... All bridges in the uk are marked out in feet and inches (some with metric also) BUT virtually all garage forecourt canopies are marked in metres ..... ...Because fuel is sold in litres. Quote Link to comment Share on other sites More sharing options...
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