Post by rks on Jun 18, 2016 11:44:19 GMT -6
Replaced my scooter's front tire yesterday, for the first time. Bought a couple of Michelin City Grips last year, in the 110/90-12 size, so I'd be prepared for this job. Even though the 120/70-12, Chinese original wasn't completely worn out, it was scalloping, which causes a bothersome vibration. Can't really complain too loud.... I did run it a little over 9,800 miles.
This new, 110/90 tire, measures 3.625", or 3 and 5/8 inches larger in circumference, than the 120/70 City Grip that is on the drive wheel. Mounted tires measured, 61.5" compared to 57.875". This calculates to 1030.24 revs per mile for the 110/90.....and 1094.75 revs per mile for the 120/70. I knew this would have a positive effect on my odometer, because it has always read a little more than the actual distance travelled.
So today I took my new tire out for a test ride, making sure to note the mileage before leaving (9,838.1)....turned on my GPS trip tracker, and off I went. When I got back home, odometer read 9,873.3 (or 35.2 miles).....GPS said I had covered 35.11 miles. Not bad for a China meter, is it. All you need, is to have the right size tire.
Won't get around to changing out the drive tire until this fall, but when I do, it should reduce engine revs by about 6.24%, so if I'm turnin 5500 at 40 now, it should be somewhere near 5160 at 40, with the taller tire.
This new, 110/90 tire, measures 3.625", or 3 and 5/8 inches larger in circumference, than the 120/70 City Grip that is on the drive wheel. Mounted tires measured, 61.5" compared to 57.875". This calculates to 1030.24 revs per mile for the 110/90.....and 1094.75 revs per mile for the 120/70. I knew this would have a positive effect on my odometer, because it has always read a little more than the actual distance travelled.
So today I took my new tire out for a test ride, making sure to note the mileage before leaving (9,838.1)....turned on my GPS trip tracker, and off I went. When I got back home, odometer read 9,873.3 (or 35.2 miles).....GPS said I had covered 35.11 miles. Not bad for a China meter, is it. All you need, is to have the right size tire.
Won't get around to changing out the drive tire until this fall, but when I do, it should reduce engine revs by about 6.24%, so if I'm turnin 5500 at 40 now, it should be somewhere near 5160 at 40, with the taller tire.
