Bicycle Mechanics - What size crank/pedal threads

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bbeasley
11-24-12, 06:38 AM
I've got a 2009 Trek 2.3 roadie with Speedplay Zero pedals. I want to try these (http://www.realrecreationusa.com/p/Sunlite-Pdh41479-Pedal-Extenders-9-16-Crank-27-5mm-8489315.html) pedal extenders. Are my crank/pedals 9/16" ?

Thanks!

HillRider
11-24-12, 06:47 AM
Yes, they are. Remember the left pedal is left-hand threaded and removes by turning it clockwise viewed from the left side of the bike.
dsbrantjr
11-24-12, 06:50 AM
Those adapters should work fine. Remember to grease (I recommend TefGel) both sets of threads before you assemble to keep the threads from seizing. Use a proper pedal wrench and tighten them firmly so they don't come loose and strip the crank threads.

cranky old road
11-24-12, 06:51 AM
Do you already have the cleats adjusted for maximum clearance?
bbeasley
11-24-12, 07:16 AM
Do you already have the cleats adjusted for maximum clearance?

Yes, and I still ride with my knees out and see shoe rubbing marks on the crank arms.
dsbrantjr
11-24-12, 07:27 AM
Sunlite makes a 21mm spacer (SKU 41617) vs the 27.5mm 41479 pictured which will give you some clearance without placing your feet quite so far out.