Jakedatc

I have thousands of miles on my Ultegra road pedals but not a ton on my SPD mtn bike pedals. Could i swap them? I have the plastic tool on order so i haven't tried opening them to see if they are the same length.

while i'm here.. how fast should the pedals spin when not clipped in.. like on the road pedals i flick them and they fly around. the mtn bike ones seem to have a much thicker grease slowing the spin. not sure which is better

trailangel

Why don't you just change the whole pedal?

Jakedatc

Because if i can swap the spindle from pedals i'm not using to pedals I am then it costs 0$ (shoulda mentioned that i'm using Crank Bro's on the mtn bike now)

trailangel

Huh?

Jakedatc

perhaps this is not the question for you.

davidad

When you remove the axle assembly you can wipe it down and pump grease into the shell. When you reinstall the axle the excess grease will pump out the old grease and you will be ready to go.
The only way you can be sure that the axles are interchangeable is to remove and compare them.

CliffordK

Shimano does have all of their parts diagrams online, so you could compare the parts diagrams and parts numbers. Just search google for part description followed by "PDF".

https://si.shimano.com/php/download.p...6800-3607A.pdf

I've rebuilt a pair of SPD pedals. They are quite easy. Just pull the spindle with the plastic tool.

Disassemble. Grease, reassemble, and adjust cones. Slide the spindle back in.

Shimano uses loose ball bearings which you could replace too.

Oh, I didn't realize one could buy extra-long axles. Interesting option for some riders. Anyway, the diagram lists 3/32" bearings. I see 24 per pedal on the diagram, so I'm not sure why they list 62 (each pedal, or pair?). The one I rebuilt did have a bunch of little tiny bearings though, so perhaps 62 is the correct number.

Comparing the diagrams for the PD-6800 and PD-M520, the 6800 appears to have a longer sleeker spindle, and no place for the 15mm pedal wrench. But, who knows, they still may interchange.

Bezalel

Road pedals are single sided and need to orient themselves for easy clipping in. MTB pedals need more ingress protection.

Jakedatc

Thanks Clif.. that's what I was looking for. Looks like they won't play together. I'll try to regrease them and tighten the play out of them a bit

Zukoda

I'm still trying to figure out why it wouldn't be easier to just put the pedals on whatever bike you are going to ride that day... I do admit I don't know much about pedal construction so maybe I'm missing something?

Jakedatc

one are road bike pedals and one are mountain bike pedals. I ride my road bike 4000mi a year and these mountain bike pedals 0 miles per year (they are sitting in a drawer) If the spindles were the same I could have made the road pedals "newer"

It was a minor thing i was trying to do.. no big deal. they look the same outside of the pedal body but the spindles are quite different inside so it can't be done.

davidad

When you adjust them make sure that there is a small amount of preload that feels like a little drag on the bearings. Then they will be properly adjusted.