Pedelec sensor - missing magnets

[Phil the drill]

Originally Posted by the_killjoy

Did the 42 fit without trouble ~ is it standard chainwheel, I could do with a bit more speed on the flat.

Hi Killjoy,

The 42t chainring is a standard single ring 5 hole 110bcd ring, and as such fits easily in place of the standard 52t one. I sourced mine form SJS, over the internet.
A couple of points though
1) A 42t ring will give you less speed on the flat not more, since you are reducing the circumference of the front ring. I fitted mine to improve the hill climbing ability of my 905se - I found it to be overgeared for the many nasty switchback climbs on the narrow lanes around me.
2) I combined mine with a change of rear cassette to an 11t-34t one. These are difficult to get hold of, but in my opinion worth it. In combination with the chain ring above you will get significantly lower gearing for the hills, combined with a slight increase in speed in top gear. In other words, increased gear range.
3) If you fit a smaller front chainring on the 905se it is likely to keep falling off in the low gears, due to the angle of the chain path. This is easliy solved by bolting the new chainring on the inside of the crank bracket (as though it were a 2nd ring) rather than in the top gear position on the outside.
4) The plastic chain guard won't fit the ring, but is easy source cheap and equally ineffective chainguards - if you really want one. A 'proper' one would be nice, but that's a whole different story.....(see above).

Cheers, Phil

[the_killjoy]

I realised after I posted that I had the comment on gearing round the wrong way ~ It had been a long day.

[ElephantsGerald]

Originally Posted by Phil the drill

2) I combined mine with a change of rear cassette to an 11t-34t one.

Hi Phil,

How did you deal with the motor wire coming out of the axle when you fitted the new 11-34T freewheel?

Did you cut the cable, or did you undo all the connections at the controller?

Regards,

Elephants

[Phil the drill]

Originally Posted by ElephantsGerald

Hi Phil,

How did you deal with the motor wire coming out of the axle when you fitted the new 11-34T freewheel?

Did you cut the cable, or did you undo all the connections at the controller?

Regards,

Elephants

Hi Elelphants,

I unclipped the wire from the frame, traced it into the wiring box and just disconnected it there. The wiring's rather tight so its a bit of a squeeze getting it all back in again afterwards, but its not too hard.
What you will have to watch is the tool you use to undo the cassette - Shimano's own, and the the Park one won't work because the axle diameter is too great to fit through the hole in the centre of the tool. Drilling that hole out is almost impossible as the alloy is so hard. I have a (cheaper) alternative made by Cyclepro (CPT203) which has a square hole designed to take a socket driver (not needed as you usually just clamp it in a vice and turn the wheel to remove the cassette), which is large enough for the axle and wiring to be easily threaded through.

Hope that helps, cheers Phil

[BrizzleBoy]

Originally Posted by ElephantsGerald

Hi Phil,

I'd be interested to know what chain guard you end up fitting. I'm slowly running out of trousers that aren't covered in oil

Regards,

Elephants

I dont know why but that tickled me

[Mussels]

Originally Posted by Phil the drill

Hi 4) The plastic chain guard won't fit the ring, but is easy source cheap and equally ineffective chainguards - if you really want one. A 'proper' one would be nice, but that's a whole different story.....(see above).

I have found the plastic guard is essential on the 52 teeth chainring to stop the chain falling off, I managed about 100 feet until it dropped off the inside. Incidentally I am now running a 36 tooth chainwheel with the original freewheel and it is much better, I use all the gears and can still pedal up to about 25mph. I have a suntours 13-28 freewheel waiting to be fitted but I have to wait for the toolkit to arrive to do that.

Back to the subject - my pedelec sensor is broken, I suspect it was my chain derailing that did it. I'm looking at alternatives and a thumb switch on the left hand grip is tempting, what does the controller look for from the pedelec switch - is it just a closed circuit or does it need a constanty switching circuit?
Edit: answered my own question now, the magnets are not evenly spaced and the controller knows if I'm back pedalling. Not going to be an easy one to get round.

[Mussels]

I'm getting individual tools now, can someone tell me if this will fit the Megarange freewheel on the Wisper? The internal diameter is good but I'm not sure if all Shimano Freewheels use the same tool. It says Uniglide but is pictured with a Hyperglide sprocket and I'm suspicious.
Park Tools FR1C Uniglide Shimano

[Phil the drill]

Originally Posted by Mussels

I'm getting individual tools now, can someone tell me if this will fit the Megarange freewheel on the Wisper? The internal diameter is good but I'm not sure if all Shimano Freewheels use the same tool. It says Uniglide but is pictured with a Hyperglide sprocket and I'm suspicious.
Park Tools FR1C Uniglide Shimano

Are you sure that the axle will fit through this tool? I bought a Park one and the oversized axle on my motor would not fit through the centre of the tool. It is almost impossible to drill this out as the alloy is so hard. I used the cyclepro equivalent (link: Cyclepro Multi Freewheel Remover Shimano Uniglide Cycle Accessories Workshop Bicycle Tools General Maintenance Cyclepro Multi Freewheel Remover Shimano Uniglide ). This is a well made equivalent, fits and the axle goes though it, plus you can use a socket set on it if you don't wish to go through the normal routine with a bench vice. Oh, it's cheaper too!

Cheers, Phil

[Mussels]

Originally Posted by Phil the drill

Are you sure that the axle will fit through this tool? I bought a Park one and the oversized axle on my motor would not fit through the centre of the tool. It is almost impossible to drill this out as the alloy is so hard. I used the cyclepro equivalent (link: Cyclepro Multi Freewheel Remover Shimano Uniglide Cycle Accessories Workshop Bicycle Tools General Maintenance Cyclepro Multi Freewheel Remover Shimano Uniglide ). This is a well made equivalent, fits and the axle goes though it, plus you can use a socket set on it if you don't wish to go through the normal routine with a bench vice. Oh, it's cheaper too!

Cheers, Phil

I'll go with the cheaper option and stop arguing.