Calibrating my Bike Computer
07-05-00, 07:52 PM
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Picked up a bike computer today. The calibration instuctions were pretty straight-forward, so my wife and I got out in the drive and I rolled off one revolution. We measured, came up with 80 inches, multiplied times 25.4 to get a result of 2032mm.
My tire is the IRC Fiesterra, 26 x 1.95. The instructions that came with my 'puter list some "popular tire brands" and their calibrations. Here is an excerpt from the table:
ATB 26 x 1.40 = 1995mm
ATB 26 x 1.50 = 2030mm
ATB 26 x 1.75 = 2045mm
ATB 26 x 2.00 = 2099mm
I wasn't sure if "ATB" was a brand or a type; my search for "atb" on the MTBReview site revealed only a single reference ("Panaracer Duster II ATB tire"). But -- please correct me if I'm wrong -- numbers are numbers. If an "ATB 26 x 1.75" translates to a circumference of 2045mm and an "ATB 26 x 2.00" translates to 2099mm... shouldn't my IRC Fiesterra lie somewhere between 2045mm and 2099mm, instead of the 2032mm that my measurement produced?
Pardon my newbie ignorance, and thanks in advance!
My tire is the IRC Fiesterra, 26 x 1.95. The instructions that came with my 'puter list some "popular tire brands" and their calibrations. Here is an excerpt from the table:
ATB 26 x 1.40 = 1995mm
ATB 26 x 1.50 = 2030mm
ATB 26 x 1.75 = 2045mm
ATB 26 x 2.00 = 2099mm
I wasn't sure if "ATB" was a brand or a type; my search for "atb" on the MTBReview site revealed only a single reference ("Panaracer Duster II ATB tire"). But -- please correct me if I'm wrong -- numbers are numbers. If an "ATB 26 x 1.75" translates to a circumference of 2045mm and an "ATB 26 x 2.00" translates to 2099mm... shouldn't my IRC Fiesterra lie somewhere between 2045mm and 2099mm, instead of the 2032mm that my measurement produced?
Pardon my newbie ignorance, and thanks in advance!
07-05-00, 11:30 PM
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How i do it...
Gax, can you put your number (2032mm) into the computer over riding the internal setings? If so, this is how i do it, get some chalk, and mark up your tire, now roll the bike so it leaves 4 chalk marks on the ground, measure between the 1st and 4th chalk mark, and divide by 3 (3 rotations of the tire). This will get you a more acurate count on the size of the tire.
Ds for ATB(all terrain bike) thats just another word for MTB(mountain bike). The factory measurements will probly be a bit different from yours.
You may want to change your computer as your tire wares down, as you will loose a few mm, and your computer will show numbers higher then what you really did (however not much at all, maybe .05% if that)
Sorry for the bad spelling! my spell checker isnt working right now, and im horible!
Hope this helps.
Ds for ATB(all terrain bike) thats just another word for MTB(mountain bike). The factory measurements will probly be a bit different from yours.
You may want to change your computer as your tire wares down, as you will loose a few mm, and your computer will show numbers higher then what you really did (however not much at all, maybe .05% if that)
Sorry for the bad spelling! my spell checker isnt working right now, and im horible!
Hope this helps.
12-26-08, 10:44 AM
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RESURRECTED BIZNATCHES!!!
Happy Hannuka
Sorry...I'm really, really bored.
Happy Hannuka
Sorry...I'm really, really bored.
Last edited by ed; 12-26-08 at 10:54 AM.
12-26-08, 10:17 PM
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All-Terrain Bicycle
(ATB) A bicycle with straight handlebars, sturdy fat tires, and wide-range gearing designed for off-road use. Also called Mountain Bike.
Seriously, try making your measurement again, over several revolutions of the tire, with your weight on the bike.
Last edited by deraltekluge; 12-26-08 at 10:20 PM.
12-27-08, 01:20 AM
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Ah, but did you google the world?
All-Terrain Bicycle
(ATB) A bicycle with straight handlebars, sturdy fat tires, and wide-range gearing designed for off-road use. Also called Mountain Bike.
Seriously, try making your measurement again, over several revolutions of the tire, with your weight on the bike.
All-Terrain Bicycle
(ATB) A bicycle with straight handlebars, sturdy fat tires, and wide-range gearing designed for off-road use. Also called Mountain Bike.
Seriously, try making your measurement again, over several revolutions of the tire, with your weight on the bike.
I don't think the OP is gonna hear your advice- his posting was from the year 2000.
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12-27-08, 09:58 AM
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Yeah, I just noticed. What's going on with people resurrecting old threads? I've seen a bunch of old stuff lately, but the dates on this one slipped by me.
12-27-08, 10:17 AM
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