Today my dealer changed my rear sprocket from a 40 to a 37 tooth. After doing this my PRM? skid plate no longer works. Does anyone have any ideas on which one will fit?

 

Why won't it fit? I could see if you changed to a bigger rear, but you went to a smaller one. What's the deal? Give us more info on this. (ie: bolt hole won't line up. - chain hits the skid plate. - etc.)

 

I don't understand either.

 

Huh,....?
Should fit...........
Sure he didn't go to a 42?
My Graydon skid had to be modified to fit the 42

 

I have the PRM Skid Plate and had the same problem. I'm running 17-37 gearing. Is your friend also running the 17 counter sprocket? If so, the problem is in obtaining proper chain adjustment without the brake rotor hitting the skid plate.
When I installed my 17-37 sprockets and put the PRM skid plate back on, the brake rotor hit the plate when properly adjusting the chain tension. I couldn't shorten or lengthen the chain to make it not hit the PRM so I cut a slot in the PRM which allows the brake rotor to clear it. The finished slot is just wider and a little longer than the brake rotor. I have been rock bashing and the skid plate, where the slot is, is holding up just fine. I cut the slot clear through the PRM. The bad news is you have to install the PRM to properly and accurately measure and mark where the slot goes. Then remove, cut, re-install and repeat as necessary until you get it right. I guess another option would be to reduce the brake rotor diameter.
I don't know of any other skid plates that may not have this clearance problem.

 

Can I ask you what you used to cut it? Also you don't happen to have any pictures of where you cut it do you?

 

I used a Dremmel Tool with the cut-off disc's to do the cutting.
It didn't take too long.
I just bought one of those fancy digital camaras for the wife's B-day.
If I can pry it from her hand I'll see if I can post a pic or two.

 

hey AZ, do you like the 17-37 better? I talked with someone at Dumont pres day that was using a 15-43 and was kicking all piped ds's even though he was big like me. Was wondering what might be better for hillclimbing.

 

BigJon,
Was he the guy with stage 1,I think I talked to him too,he was beating a stage 3 up comp hill.

 

I like the 17-37 for all around riding but I'm not the fastest up Comp Hill. The lower your counter sprocket, the better off you are for hill shooting but you lose top end speed.