Quote:
Originally Posted by tillson
Thanks John C. Is it an easy job to do yourself? Any special tools require? Do the gears need setting up again, or is it just a case of unclipping the cable as described elsewhere on the forum?
Any pointers / tips most welcome.
Kind Regards
Tom
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Hi Tom
I will do some notes on fitting the 19 T sprocket to the ProConnect.
Only special tool required is a chain cutter for shortening the chain.
You must decide on the number of links to remove and how to rejoin the chain.
The chainguard is simple to remove with the one bolt near the back wheel - the front end just unclips.
I removed only 1 link and added some further tenison by pushing the wheel to the very back of the dropout slot, and the tension seems fine (100 miles with no problem)
Removing 2 links is probably more correct (sprocket teeth reduced from 23 to 19 = reduction of 4 teeth / chain wraps round half the sprocket so need to lose 2 links), with wheel half way back in dropout. This allows sensible adjustment as and when the chain needs tensioning later on.
Certainly 2 links must come out for an 18T sprocket.
If you want a spare, chain length is always a problem on an ebike - standard length that is sold is 114 links and the bike needs
about 120 (I forgot to count the standard number).
The chain is 1/2" x 1/8" which is slightly wider than derailleur type chain and normally joined with a connecting link rather than a "bullet" pin.
The 50cycles guys use Sachs PC1 chain and
cliptype joining link - this example at SJS is black - not sure where to get silver.
Suggest you get a couple of joiners in case tension isn't quite right. Note that the spring clip must travel with the rounded end leading through the chain circuit.
The spring loaded jockey wheel on the panasonic drive has more clearance on one side of the wheel than the other - put the joiner in from the side with narrow clearance, giving you clearance for the spring clip on the wide side.
More to follow.
James