Cycle Computer set up

[Tel]

When setting up a cycle computer how far down the fork does the sensor go? Surely it will effect the readings i. e near the top (rim edge) will read slower than near the bottom (centre of hub). Hope that makes sense...

 

[cyfa2809]

i normally put mine just above where the spokes cross (towards the rim)
if you have it too far away, no reading (somebodys already thought about this )
too close and i cant remember, but where i said should sort you

 

[AR-CoolC]

It shouldn't matter where the sensor is. 1 revolution of the wheel is the same distance (and therefore speed) no matter where it is measured.

 

[Lysander]

When setting up a cycle computer how far down the fork does the sensor go? Surely it will effect the readings i. e near the top (rim edge) will read slower than near the bottom (centre of hub). Hope that makes sense...

Naw- it only registers an input, and uses this to calculate speed by the set wheel size- whether nearer the hub, or out close to the rim, a revolution of the wheel takes the same time.............personally, I have the sensor close to the hub as possible, easier to get the magnet within the recommended couple of mm or so.

 

[feetabix]

When setting up a cycle computer how far down the fork does the sensor go? Surely it will effect the readings i. e near the top (rim edge) will read slower than near the bottom (centre of hub). Hope that makes sense...

Naw- it only registers an input, and uses this to calculate speed by the set wheel size- whether nearer the hub, or out close to the rim, a revolution of the wheel takes the same time.............personally, I have the sensor close to the hub as possible, easier to get the magnet within the recommended couple of mm or so.

1 revolution equals one 'pulse'.......

 

[Xesh]

When setting up a cycle computer how far down the fork does the sensor go?

If it's wireless then it depends upon the make, but usually no more than 70cm from the head unit. If it's wired then it doesn't matter much.

Surely it will effect the readings i. e near the top (rim edge) will read slower than near the bottom (centre of hub). Hope that makes sense...

If that was true the wheel would tear itself apart, as different areas of the wheel would move at different speeds.

 

[Tel]

Yeah having thought about it it is now obvious that no part of the wheel rotates faster than any other, quite embarrassing really but hey ho it's not unusual for me to ask stupid questions...

 

[cyfa2809]

you can just delete it and put something else in and make us look stupid

 

[David B]

If that was true the wheel would tear itself apart, as different areas of the wheel would move at different speeds.

The wheel would disintegrate if different bits moved at different angular speeds; however, different bits of a wheel do travel at different linear speeds, depending on how far out you are from the hub.

David

 

[Lysander]

Aye- and the very centre of the hub axle remains stationary............it's amazing were not all killed...........


One of the best illustrations of this principle is high speed helicopters, where the real limiting factor is the ends of the rotors breaking the sound barrier..........

Lynx Record Holder from 1986