slayer 83 Posted March 14, 2012 Share Hi, this is probably such a stupid question but I really cant sort this out. I have a new polar cs200 speedometer on my road bike and I need to set my wheel size setting (mm). In the manual they have a chart listing all the wheel diameters (ETRTO) with their corresponding wheel sizes in mm. But my ETRTO size isn't on this list and I cant find any info on the web. My ETRTO is 622 x 15c. I'm probably just missing something but I just cant figure this out. Any help will be much appreciated. cheersPolar chart.bmp Link to comment Share on other sites More sharing options...
TNT1 Posted March 14, 2012 Share dunno wtf an etrto is, but what's your wheel size? In inches? Link to comment Share on other sites More sharing options...
slayer 83 Posted March 14, 2012 Share dunno wtf an etrto is, but what's your wheel size? In inches? I dont know, it doesn't give a size on the wheel and I dont have an imperial tape measure to measure the wheel if I could do that. Link to comment Share on other sites More sharing options...
owti1997 Posted March 14, 2012 Share Measure the circumference of the wheel (with the tyre fitted and inflated!) by rolling the wheel along a straight line and measuring the distance. Deduct about 10mm allowing for compression while riding. The circ of my 29r wheel with 2.25 tyre fitted is 2208mm. Link to comment Share on other sites More sharing options...
Captain Fastbastard Mayhem Posted March 14, 2012 Share Have a look at the sidewall of your tire. The size is normally embossed on there. If it's a road bike, normally it's either 700*23c or 700*25c. Link to comment Share on other sites More sharing options...
Kranswurm Posted March 14, 2012 Share Surely its worked out on the tyre size?Thats on the side of the tyre Link to comment Share on other sites More sharing options...
TNT1 Posted March 14, 2012 Share Have a look at the sidewall of your tire. The size is normally embossed on there. If it's a road bike, normally it's either 700*23c or 700*25c. There you go! Link to comment Share on other sites More sharing options...
slayer 83 Posted March 14, 2012 Share Aaha! Thanks alot, was so focused on the damn ETRTO size on the rim that I never checked the tyre! Idiot... Thanks all Edited March 14, 2012 by slayer 83 Link to comment Share on other sites More sharing options...
Honkdonk Posted March 14, 2012 Share Make a mark on your tyre sidewall with a piece of chalk, use the valve position as a starting point. Position your wheel with the valve/chalk mark on the floor. Make a mark on the floor that lines up with the chalk mark on your tyre. Roll your wheel along the floor one complete revolution in a straight line and make a mark on the floor at this point. Measure the distance between the 2 marks with a tape measure. Make sure that you use metric measurements and not imperial. That is your wheel size setting Link to comment Share on other sites More sharing options...
TNT1 Posted March 14, 2012 Share Make a mark on your tyre sidewall with a piece of chalk, use the valve position as a starting point. Position your wheel with the valve/chalk mark on the floor. Make a mark on the floor that lines up with the chalk mark on your tyre. Roll your wheel along the floor one complete revolution in a straight line and make a mark on the floor at this point. Measure the distance between the 2 marks with a tape measure. Make sure that you use metric measurements and not imperial. That is your wheel size setting So much PT. The chart has the tyre sizes in it, just use that. Link to comment Share on other sites More sharing options...
Caerus Posted March 14, 2012 Share Take piece of string, wrap around wheel and tyre to get the circumference and hey presto you are in business, mark the string and measure it on a ruler/ tape measure, this will give you your circunference. Then doing some simple arithmetic(with the newly aquired measurement) you can take the circumference to get the actual diameter of your wheel for your Polar. Here in case you not sure of the maths part. Good luck Link to comment Share on other sites More sharing options...
Caerus Posted March 14, 2012 Share So much PT. The chart has the tyre sizes in it, just use that. Depends on how accurate you want to be Link to comment Share on other sites More sharing options...
TNT1 Posted March 14, 2012 Share Depends on how accurate you want to be Yeah, I know a guy like you. Think he is a wanka as well... Link to comment Share on other sites More sharing options...
The Drongo Posted March 14, 2012 Share So much PT. The chart has the tyre sizes in it, just use that. Pfft. Took me 2 minutes yesterday. Just ran it valve to valve rev along a tape measure. 2,050. Presto! PT my ass. Link to comment Share on other sites More sharing options...
TNT1 Posted March 14, 2012 Share Pfft. Took me 2 minutes yesterday. Just ran it valve to valve rev along a tape measure. 2,050. Presto! PT my ass. Oh, look, another one. Please collect your tapout shirt when you leave. Link to comment Share on other sites More sharing options...
NotSoBigBen Posted March 14, 2012 Share dunno wtf an etrto is, but what's your wheel size? In inches? Isn't that what I get a mail about very now and then .... 'ERTO will be implemented tonight at midnight and points will be deducted for traffic offences' Link to comment Share on other sites More sharing options...
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