£15 cadence meter

[anonymous-user]

Just found this, http://www.youtube.com/watch?v=qrL476g662I

• Buy a cheap cycle computer like this
• Fit sensor to crank and receiver unit on chainstay
• set the wheel circumference to 2682mm because.....
• 88ft per minute = 1 mph
• 88ft wheel at 60 rpm = 60 mph
• 88ft = 1056 inches
• 1056 inches = 26,822mm

So when the computer displays 7.5 mph, you will be pedalling at 75 rpm. Its not pretty but for £15 what do you expect! perfect for the trainer/rollers.... dependant on the computer it might round to the nearest 0.5mph/5 rpm but is that really an issue?!...

[Kermit power]

pablo said:

Just found this, http://www.youtube.com/watch?v=qrL476g662I

• Buy a cheap cycle computer like this
• Fit sensor to crank and receiver unit on chainstay
• set the wheel circumference to 2682mm because.....
• 88ft per minute = 1 mph
• 88ft wheel at 60 rpm = 60 mph
• 88ft = 1056 inches
• 1056 inches = 26,822mm

So when the computer displays 7.5 mph, you will be pedalling at 75 rpm. Its not pretty but for £15 what do you expect! perfect for the trainer/rollers.... dependant on the computer it might round to the nearest 0.5mph/5 rpm but is that really an issue?!...

I was waiting to be absolutely amazed, until I realised I'd misread your title as "£15 power meter"!

[S6PNJ]

I suggested this back in Sep 12 and linked to this article which gives a bit more info.