Small deraileur sprocket clearance
I've been on BF for a while now, posting mostly in the General Cycling and Clydesdale forums. In preparation for at attempt at commuting to work, I had a rear rack installed to hand panniers from. Riding back, the bike was making a little more noise than usual. I finally noticed that the bolt that holds the allen nut that secures the bottom of the rack to the frame is scraping against the chain int the rear derailleur when it's sitting in the lowest (smallest) sprocket. Any thoughts on how to reattach this without the nut? There's plenty of clearance when the rack's not there.
I thought about just replacing the bolt/not on that side with a loop of wire, but that won't be very secure. Help, please!
That's a common interference if the rack eyelet is low on the dropout and I've had it happen to a couple of bikes I've mounted racks on.
Normally the eyelets themselves are threaded (M5x.8 mm almost universally) and the nut is just an extra security measure. I thread the rack attaching bolt into the eyelet and choose (or cut) a bolt just long enough to end up flush with the eyelet's inside face. Tighten it securely and maybe use a bit of blue Locktite for extra piece of mind. I've never had one come loose even without the nut.
The eyelet on the non-drive side usually has plenty of clearance so a longer bolt with an extra nut can be used with no problems.
You may also be able to put a button head bolt through from the inside of the frame and use a nut on the outside. That's if HillRider's advice isn't able to be followed.
Took a closer look, and the eylets aren't threaded. However, I noticed that there's a second set of eyelets behind the regular ones, about an inch back and the same height. It's a bit of a stretch to attach the rack there, but nothign that should cause problems. I think there's enough clearance now; I have a ride on gravel and packed dirt tomorrow that should shake out any problems. (I'm bringing a small pair of pliers along tomorrow in addition to my usual multitool so I can remove the rack if needed .)