77-78 RM/PE chain adjuster wheel spacer size

[LWC82PE]

Does any know the measurement across the flats on either of these 17mm ID wheel spacers?
Would be interested to buy one too otherwise i will just make them.


Part # = 64781-41100
Part Description = SPACER,CHAIN ADJUSTER
Model Count = 5
PE250B 1977 246 PE250 DUAL PURPOSE
PE250C 1978 246 PE250 DUAL PURPOSE
RM250B 1977 246 RM250 OFF ROAD
RM250C 1978 246 RM250 OFF ROAD
RM370B 1977 372 RM370 OFF ROAD

or from alloy swingarm

Part # = 64781-41710
Part Description = SPACER,CHAIN ADJUSTER
Model Count = 3
RM250C 1978 246 RM250 OFF ROAD
RM250C2 1978 1/2 246 RM250 OFF ROAD
RM400C 1978 402 RM400 OFF ROAD

[147]

20mm is what my 81 pe175 arm has.

[LWC82PE]

But is that for 15mm axle? I have 76 RM spacers for 15mm and they are 19mm across the flats, but i need to know what the 77 or 78 spacers are which are for 17mm axle.

[Noel]

    Measure the slot in the swing arm?

[LWC82PE]

I don't have one to measure. The whole idea is to make the swingarm slots suit these spacers 

[shelpi]

I just measured the slot in a RM250B swing arm that's laying around = 19.5mm
let me know if ya need any more specs 

[LWC82PE]

19.5, was that on the RHS? I think the left side is narrower because the axle steps down to 15mm there? I just need to know the distance across the flats of the 17mm ID spacer on the RHS as i already have 15mm ID spacers from the A model to work from. if the RHS is 19.5mm, with a 17mm nominimal hole ID that only leaves 1.25mm thickness at the flats which kinda seems a little thin. I know the later PE spacers for 17mm axle are around 21mm so that leaves more thickness at the flat areas Thanks.

[shelpi]

slot = 21.5 on the right hand side/brake torque arm side
slot = 19.5 on the left hand side/ sprocket side
can give more swing arm specs if you want but will have to remove a back wheel if ya want other stuff

[LWC82PE]

The 17mm side is the same as 1980 PE then because they are 21mm across the flats which would go in a 21.5mm swingarm slot. That all i really need to know for now. Thanks a lot.

[shelpi]

no worries, have fun