coasterbrakelockup
Join Date: Nov 2004
Location: parts unknown
Posts: 824
Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
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The problem is you can't use a coaster brake with a spring loaded chain tensioner, and you usually have to have a chain tensioner on a rear suspension bike to keep the chain from falling off when the suspension flexes.
Depending on what kind of transmission you're using with the motor you may not be able to use one on that side either.
Your best bet is to use a hard-tail frame with suspension in the seat and/or seat post.