Replacement crank arms on Brose motors?

KathyJ

New Member
Hi all.

I'm looking to shorten my crank arms (because I'm short) on both my Bulls bikes with Brose motors. I have a 2017 Lacuba EVO e45 with either a Brose S or TF motor (can't nail down the spec on that one but it's a Class 3) and a 2019 E-Stream EVO AM 4 with a Brose S-mag (Class 1). I'm a newbie to getting my hands dirty and I'm not sure if I can go with any old ISIS cranks for ebikes or if I need anything special. Any advice would be helpful.

Thanks!
 

BULLSBarney

New Member
Your Lacuba has the Brose Drive TF and came with either 170 or 175mm arms depending on sub-model and size. You can replace the arms with a 165mm set from any manufacturer as long as it's compatible with the Brose system. Here's the part number of a compatible set that's made in 165mm, FSA CK-746/IS. You can contact your local shop to order. Hope this helps!
 

KathyJ

New Member
YES! It does help! This is probably the best info I've ever gotten on the bike. Ever. ❤️

Would you happen to know if it needs a special crank puller? We tried to get them off this weekend but there's nothing behind the crank for the puller to hit, if that makes sense. ie, The width of the hole in the crank is the same as the width of the hole in the motor/bb, so the puller just screws in and doesn't lift the crank out. (I probably should have taken a pic at the time.)

Thanks!!
 

BULLSBarney

New Member
I use the Parktool CCP-44. Here's a quick video tutorial from our buddies over at Parktool,
.

Also I forgot to mention your E-STREAM should already have 165mm crank arms. Happy I could help. Enjoy your ride!
 

KathyJ

New Member
Thanks again! Very cool video. I'll probably run out and get my own crank puller (I should have my own anyway) and play around a bit. :)