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42
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Discussion Starter · #1 ·
So I got a fairly swanky bike speedo rigged up and was looking for set-up tips. Specificaly that 4 digit code that tells it what wheel size your using. I remeber that thouse number do transfer between differnt bike speedos so if some one could tell me thiers that would rule.
 

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Perpetual Project
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3,695 Posts
Each bike will take different codes, or rather different tires will. So knowing somebody else's code won't help you much. Your instructions should give you an equation to multiply or divide or whatever to find what # you need for your bike. The measurment you'll need is to mark a spot on your tire witha sharpie, then lay a tape or string on the ground, and roll the bike forward till you get one revolution of the wheel, i.e. the mark comes back to the ground. Thats the # you'll need to calculate.

If you can't figure out the calculation that the instructions give you, do a google search for sigma cycle computer motorcycle or some such thing, I know theres pages that have how-to's.
 

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POOP
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474 Posts
I just put a sigma 1606L on my bike last night. It's a pretty nice unit for $35. That number is not a "code" but a measurement. It is the wheel size in mm. To calculate your wheel size measure the TOTAL height of your wheel and tire then multiply by 3.14 (or Pi if you are really anal). I had a friend drive in front of me doing 60 to verify my speedo and everything checked out fine.
 

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Death or Glory
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621 Posts
To calculate your wheel size measure the TOTAL height of your wheel and tire then multiply by 3.14 (or Pi if you are really anal).
I think a better way to do that would be to mark your tire and the ground, push the bike forward to where the mark is at the ground again and measure between the two. What you did works just fine, I just think it'd be more difficult to try to get the exact diameter of the tire.


We'll see though. I bought the same model and am going to calibrate it in the morning.
 

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Function IS Form
19 Z900, 88 Kat11
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17,433 Posts
I rode down the highway next to someone with their car at 70 mph and fucked with the settings until mine said 70.
 

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is not your fucking bro
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if your 93 - 98 900rr has a 130/70zr16 tire your total rim/tire hieght is 588.4 mm

130 x .7=91 x2=182 thats tire height, doubled the first because you have two halves to count. 16 inch rim so 16x25.4(mm in an inch)=406.4 406.4 + 182= 588.4mm

i guess if they want 4 digits it is 0588
 

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Function IS Form
19 Z900, 88 Kat11
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17,433 Posts
But bike tires are curved. The adding the sidewall height to the rim diameter is shorter than the full tire diameter.
 

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Function IS Form
19 Z900, 88 Kat11
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17,433 Posts
Yeah I know where you're comin from.

Bike speedometers also tend to be off as you go around corners because of it.
 

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POOP
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474 Posts
if your 93 - 98 900rr has a 130/70zr16 tire your total rim/tire hieght is 588.4 mm

130 x .7=91 x2=182 thats tire height, doubled the first because you have two halves to count. 16 inch rim so 16x25.4(mm in an inch)=406.4 406.4 + 182= 588.4mm

i guess if they want 4 digits it is 0588
You forgot to multiply by 3.14 to get the circumference. You only calculated the diameter. 588.4 x 3.14= 1847.5
 

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Naked from the waste down
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1,334 Posts
Mounting and calibration take seconds.

Read the instructions that came with it.

You will need to measure. Everything will depend on the placement of the sensor.
 
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