Hemstein

I recently purchased Stamp 7 pedals. The spindle has an 8 mm allen key. I then bought 15 mm pedal extenders. The hole in the extenders is not large enough for the allen wrench to go through the extender and into the end of the spindle so I can then tighten the extender before installing on the crank. The extender has the usual flat spots for a pedal wrench.

Has anyone encountered this? There doesn't seem to be any other way to tighten the extender on the pedal spindle.

Is it possible to buy an extender with a larger diameter hole for the allen wrench?

thanks

Bucksnort

HillRider

An 8 mm (or 11/32") drill bit should make the hole the right size.

Bigbus

I must be missing something here I thought you install the extenders on the cranks with a regular open end wrench and then install the pedals on the extenders using an Allen wrench. What am I missing here? I'm old and easily confused, but this is troubling me.

dsbrantjr

The OP states "The hole in the extenders is not large enough for the allen wrench to go through the extender" So if the extenders are on or off of the crank he cannot tighten the pedals into the extenders.
So Hillrider's suggestion to enlarge the holes should work if the (presumably) steel has not been hardened.

Bigbus

So if I'm understanding you correctly, the pedals are tightened into the cranks from the frame side and not the outer side? Hence, the Allen wrench has to pass through the extenders to reach the pedal shaft.

Edit-I looked up the Stamp 7 pedals (they are biggies, aren't they?) and now I understand. Thank you dsbrantjr.

dsbrantjr

Yes, there are no wrench flats on the pedals. And just to add to the confusion, you have to turn the hex wrench counterclockwise on the drive side, and vice versa, as a result.

HillRider

Shimano's XT-level MTB pedals also have no wrench flats but only an 8 mm hex socket on the crank end of the axles. They also require rethinking how to turn the wrench.

JanMM

Seems that some pedal extenders cannot be used with some pedals.

andrewclaus

Not quite. An 8 mm hex is measured flat face to flat face. You need a larger hole to fit the points of the hex. (Ask me how I know....)

These extenders have a large hole. In the questions section, they say a hex wrench will fit through them.

ChinookTx

Depending of your pedals, you may be able to grind a wrench flat. I did just that with a belt sander and some M785 pedals.

HillRider

Details, details....... The concept remains valid but the hole has to be bigger.

big john

I've used extenders since I had to have them custom made and I have not tried extenders with holes and I would be suspect of their strength.
I always use pedals with wrench flats but they are becoming more unusual. I don't like the stupid 8mm allen thing.

big john

It also says "Extended 15mm form the crank give you a comfort riding,avoid your keel or leg scratch with your bike, "

Slightspeed

I've been using pedal extenders for years. On pedals without wrench flats, I screw the extenders to the pedal arm using the flats on the extender, then using a rag to protect the pedal shaft, take a pair of vice grips and snug the pedal to the extender. Never had a problem with them loosening (they kind of self tighten as you ride) or removing them the same way. I grease the threads before assembly just in case.

Edit: I just looked up Stamp 7 pedals. Wierd looking suckers. You would need a very thin vice grip to grab them. The drilled extenders may be your only answer.


This is an XT pedal without wrench flats with a pedal extender. The hex just in board of the pedal turns with the pedal, and is no help for tightening. I just grip the shaft with padded vice grips and snug it up. No big deal.