seosamh
06-14-07, 12:57 PM
just got myself one, cheap enough, 20 quid for a cateye enduro 8, but was wondering since i've got a 2.3 tyre on the front and 2.1 on the back how important setting the tyre size is to accurate data?
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neilfein
06-14-07, 01:08 PM
Set it for the wheel you have the sensor on.
seosamh
06-14-07, 01:17 PM
Set it for the wheel you have the sensor on.
just as i thought, cheers for the confirmation tho! :)
just as i thought, cheers for the confirmation tho! :)
adrien
06-14-07, 01:19 PM
what matters most is circumfrance, not width. The computer figures out how far the bike goes based on how much pavement is covered by the wheel with one rotation. Usually the tables have widths so they can figure out the height of the sidewall and hence get a good read on the overall circumfrance of tire plus wheel.
Even if the wheels were a different circumfrance, the key would be to key the computer to the size of the wheel with the sensor. I'd suggest in this case you key in the size of the tire on the wheel where your sensor will go.
My head hurts now. sorry.
Even if the wheels were a different circumfrance, the key would be to key the computer to the size of the wheel with the sensor. I'd suggest in this case you key in the size of the tire on the wheel where your sensor will go.
My head hurts now. sorry.
seosamh
06-14-07, 01:23 PM
what matters most is circumfrance, not width. The computer figures out how far the bike goes based on how much pavement is covered by the wheel with one rotation. Usually the tables have widths so they can figure out the height of the sidewall and hence get a good read on the overall circumfrance of tire plus wheel.
Even if the wheels were a different circumfrance, the key would be to key the computer to the size of the wheel with the sensor. I'd suggest in this case you key in the size of the tire on the wheel where your sensor will go.
My head hurts now. sorry.
aye really should just tell you to get a tape measure out and type in the radius instead of this tyre size malarky...
Even if the wheels were a different circumfrance, the key would be to key the computer to the size of the wheel with the sensor. I'd suggest in this case you key in the size of the tire on the wheel where your sensor will go.
My head hurts now. sorry.
aye really should just tell you to get a tape measure out and type in the radius instead of this tyre size malarky...
Winter76
06-14-07, 02:11 PM
Sheldon Brown's site has some pre-calculated sizes for you if the measuring doesn't work out.
seosamh
06-14-07, 02:43 PM
Sheldon Brown's site has some pre-calculated sizes for you if the measuring doesn't work out.
cheers will have a wee google for that, i'm thinking the best way will just to cycle what i know is a mile and then adjust from there, casue i'd imagine there's alot of variables, type of tyre, tyre pressure and the like that will make a big difference no doubt..
cheers will have a wee google for that, i'm thinking the best way will just to cycle what i know is a mile and then adjust from there, casue i'd imagine there's alot of variables, type of tyre, tyre pressure and the like that will make a big difference no doubt..
Kimber
06-14-07, 05:44 PM
A good way is to make a mark on you tire close to the tread, with that mark straight down mark the ground below the mark on your tire, then roll the bike forward three revolutions of the tire and mark that spot on the ground. Then use a tape measure and measure the distance between the 2 marks and divide by 3 this averages and IMHO gives a more accurate circumfrance.
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