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xr250
04-18-2008, 04:52 PM
I've got a SuperTrapp on an old 1986 XR 250 and
am looking to add some discs. I haven't taken
it appart yet, but the actual outside diameter of the discs
themselves is just under 3.75 inches. The diameter of the end of the
pipe itself is 4 inches, so I wasn't sure if these are
called 4 inch discs, or if my SuperTrapp is so old that
3.75 inch discs are not made anymore. I've seen 4 inch
and 3.5 inch sized discs on ebay...
Any info appreciated.

bschultz
04-21-2008, 09:11 AM
The 4" discs are 3.75".
It's easier to say 3", 4" and 5" than 2&15/16", 3&3/4" and 4&5/8".

xr250
04-22-2008, 01:21 AM
Thanks for the clarification! I'll be adding more discs now that I know the
right size.