sip speedo gear ratio setting??? getting speedo right

[bjhart]

Just about to try mine out with a measured circumference of 1320 , assuming this does not match the GPS perfectly should tyre size be fine tuned or the speedo gear ratio.... can't get my head round which one would impact the odo , I think tuning the tyre size would mess that up???

[Shipleystevep]

The problem with the sensor on the front wheel is that the magnet (or stud) moves out of alignment with the sensor on every bump or every time you brake. Simple cure for this is to use a strip magnet and position the sensor in the middle, then it mostly stays aligned over bumps etc.
The really trick way is to mount it using the rear hub and back of the crankcase. (But I couldn't be arsed)

When you fine tune tyre circumference with help of a GPS, it's a really good speedo

[Shipleystevep]

Ps, I gave up on the speedo drive method as it wasn't as good.

[Shipleystevep]

When the wheel bounces upwards the big magnet stays in touch with the sensor

[philcasino1973]

i mounted the sip bkt in the rear of the engine shocker mount... bonded a stud in then attached bkt lines up perfectly with magnet bonded to rear hub ...fully adjustable ..works great and cable is just long enough to reach headset
phil

[Nerdy Norm]

You don't need a magnet at all as it's an active sensor. You just need something constant for the sensor to pick up on. Mine uses the wheel nuts, you set the speedo for the number of nuts.

[Shipleystevep]

True, but if you don't mount it on the rear, or rig something at the front so the sensor moves and keeps aligned to the stud it's all over the place

[Monty]

I'm using an Acewell but the sensor is the same type. I made a bracket that is bolted onto the hub using the axel shaft. It holds the sensor pointing at the magnate that fitted in the hub grease nipple hole. The distance stays constant as they move together. I used an old stainless steel bridge that never fitted so it's thin and strong. The sensor runs down the fork and most can never see it behind the shock. Only down side I have to undo the sensor to change the tyre

[shocky]

I made my own sensor mount from a piece of dexion shelving and a fork link bush inner as the sip one didn't really fit well or looked awkward I set my circumference at 1350 and fine tuned from there now it's spot on with the GPS

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