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View Full Version : speedometer.help.please

X7rocks
09-04-2007, 08:12 PM
alright.i.bought.a.speedo.for.my.bike.to.,replace. my.stock.garbage
anyhow
can.someone.tell.me.how.to.set.tire.size?
it.just.says.2124.which.that.sums.up.to.a.26.inch. bicycle.tire.
any.ideas.or.anyone.know.the.numbers.of.a.x18s.fro nt.tire?
The Nutty Professor
09-04-2007, 08:36 PM
alright.i.bought.a.speedo.for.my.bike.to.,replace. my.stock.garbage
anyhow
can.someone.tell.me.how.to.set.tire.size?
it.just.says.2124.which.that.sums.up.to.a.26.inch. bicycle.tire.
any.ideas.or.anyone.know.the.numbers.of.a.x18s.fro nt.tire?

The easiest way is to mark a spot on the garage floor. Then stop the tire out the spot and mark it. Then roll the bike forward until the mark makes 1 complete rotation. Measure from mark to mark and you have the diameter of the tire.
rene13
09-05-2007, 02:45 AM
The easiest way is to mark a spot on the garage floor. Then stop the tire out the spot and mark it. Then roll the bike forward until the mark makes 1 complete rotation. Measure from mark to mark and you have the diameter of the tire.

Genius!! always saving the day.
Blitz$M.Inc.$
09-05-2007, 04:08 AM
yo x7rocks
bout time you made it
i want one of those too
except on high speed runs my head is over the windshield and i wouldnt see it
unless it recorded it
is that number in milimeters?
The Nutty Professor
09-05-2007, 07:08 AM
yo x7rocks
bout time you made it
i want one of those too
except on high speed runs my head is over the windshield and i wouldnt see it
unless it recorded it
is that number in milimeters?

Not a problem Blitz the bike speedo's will keep your average speed and your max speed for that ride in memory until you clear it. After you speed run flip through the displays until you see itchief_rocka
The Nutty Professor
09-05-2007, 07:15 AM
I forgot something. You will want to convert your measurement (Inches) to cnetimeters I think...Anyway here's a free conversion site.

http://www.onlineconversion.com/ thumbsup
X7rocks
09-05-2007, 02:00 PM
yeah.blitz.ben.messing.with.my.bike.and.for.the.sp eedo.it.records.the.topend.which.i.think.is.sweet

the.rims.size.is.10.inches.so.i.guess.i.gotta.base .the.little.censor.at.the.lip.of.the.rim?
The Nutty Professor
09-05-2007, 02:49 PM
No X7 you need the outside diameter of the tire. If you use the rim size considering the differnce your true speed is going to be way off. Your reading will be higher than it should be. Measuring only takes a few minutes and then you're done and the speed should be pretty close to correct.
X7rocks
09-05-2007, 07:38 PM
alright.ill.take.the.measurements