nine16 wrote:

I'm in Chicago and have an '89 r5k Seed. You can use the NC30 upper tubes with cartridges and that opens the door for custom valving/shimming. Get sprockets from Tyga as mentioned. I use DID ERV3 520 chains on all my bikes. I had Bridgestones but switched to the MC21 17" rear and run Pirelli Supercorsas now.

Tyga was a dead end for sprockets. They don't have the front sprocket. I'll keep searching. Thanks for the advice about the NC30 tubes. I have one of those so I will compare them. I know where to get brand new NC30 tubes so that would be great if they work.