Finally got my conversion done on KHS mountain bike. I’m having chain line issues. Not entirely sure what is happening so bear with me as I try to explain?
I am using a 40t Lekkie chain ring on motor. I have 2-3 mm between frame rail and the ring. I don’t think I can get it any closer. (?)
in the rear, is an 11 speed cassette. on first install, it would skip terribly if you were in anything lower than 4th ring down from largest ring. (Lower meaning larger diameter ring) and it did not like the smaller diameter rings either presumably because they were too high for the speed and weight of me.
Is this normal? I.e. you basically cannot use all the gears when converting to e-bike?
After some research I found guys rearranging their cassettes to get the larger diameter rings in this narrow window of chain line availability. I tried that with little success because the design of my derailleur does not allow the larger rings to be in the chain line window because the chain gets wedged between ring and derailleur body.
So, I am at the point that I either live with it like it is and never change gears, (don’t like that option) or I find a new derailleur that allows me to get larger chain rings in the “window“ so that I have less chain slippage but that means I give up any speed because I’m always in a low gear. I am hoping there is a better option you guys can tell me about.
For what it’s worth, cassette and chain have maybe 75 miles of human powered riding. Do I need to change cassette And chain?
I am using the BBS02.
There is and adjustment screw on the derailleur called the "B" adjust screw to move the derailler farther away from the cogs so you can do the cassette mod properly. You can see the B screw on the right side of your derailler on the pic that you posted... Tighten it (or turn clockwise this scew to move your derailler farther out.) I bet this will fix your problem. This is how I did it on mine and it was requrieed and it worked.
not gonna be the motor gears... its likely the gap on the chainstay and front ring causing trouble hitting your biggest gear... also : be aware if you swapped your old chainring for a lekkie, you cant just use the same chain. new chainring = new chain. so if your old ring is 44t or whatever and u drop to a 40t up front, new chain is needed (or remove/add links to an existing chain to reach appropriate length). have u taken it to a bike shop to work through the shifting? you need to set your limit screws right firstly for proper alignment. only then u tighten the pinch bolt for the shifter cable after pulling the slack just taut. then u asjust your barrel adjuster. the order is important. otherwise you can get jumps, rough shifting, clacking noises, and not hitting all the gears or the limits arent set right.
One concern I have is: is it my chain slipping? Or can the gears inside the bafang skip (Read: strip)?
Thank you for the response. Good to know that hitting all gears is the norm.
I am going to look for a new derailleur and give that a try. Mine is old so…
Just for reference, here are a couple pics.
thats generally not normal. you should be able to hit every gear. does depend on the bike and the frame kind of though for ideal chainline function. 75 miles is nothing. you change cassettes every 2-3 chains, not sure how many miles that is, 3-5k maybe?
Idk your bike so pics or something could help. Id recommend getting it hoisted on a stand, remove the battery and just try to fine tune the shifting while its turned off, if you can. find someone w similar bike or issue see if theres a solution. good luck