Topic: Rear Sprocket & Rim Sizes

[750goes]

thanks in advance

Just another quick question.. If you saw the sprocket in the picture would you consider that
a)it is ok for a while and only normal wear & tear
or
b) should I replace it asap

I cleaned it up for the picture with a wire brush on the electric drill, just mainly to remove the crud and surface rust..
It has some sharp edges on the trailing teeth of the sprocket,, but only on one side?? being the outside edge??

Oh
Bike is 1976 750 F1, engine is 750 K6.

Also I am unsure if the Rim sizes are correct, can someone inform me if these are the right sizes for the bike, and any comment on the appropriateness of the current tyres for normal everyday road use.. or should I replace.. both tyres have plenty of tread....................................
Reading from the Back Rim - "D.I.D  JAPAN 2.15 x 18  16  90  - - 26  0713"        "J 18 x 2.15    182 DOT"
Reading from the Front Rim - "1.85 x 19 DID"

Rear Tyre - Continental Tubeless - 120/90 H18 K112
Front Tyre - Bridgestone Tubeless - 100/90 - 19 57H

thanks in advance for your comments and assistance

[kghost]

looks kinda worn but its hard to tell the way you've taken the picture.

what would be good is a picture from an angle showing one tooth so we can have a good look at the inside contour where the roller rides.

as for the tires you currently have......while theres nothing wrong with the brands they are missed matched and you would get better ride and handling with single brand made to work togther.

[ken74-550K0]

I just replaced the chain and sprockets on my bike and based on your photo yours look near the end of its life - although another photo angle that shows the valleys would be helpful.  If you decide to go down the path of changing the sprockets change the chain as well.   In my case, changing the chain and sprockets resulted in significant reductions in noise and vibration.

[cd811]

I have a big fear of a hole in my cases because the chain and sprockets were not correct.
I'd replace it.

[Clyde]

I would replace with a new one. As posted I would replace the chain and also replace the front sprocket at the same time.
The K6 gearbox is different to the F1(17T) and you should use a 18teeth front. Both use a 48 teeth rear
The rims are standard for the F1. They should have 40 spokes per wheel.
The tyre are the same size as what I am using on my F1, but I am using Metzlers. I have also used Bridgestones and Dunlops but not Continental

[TwoTired]

I've seen worse sprockets, but that one looks worn to me.  It will certainly shorten the life of a new chain used on it.

I might use it gently with and old chain.  But, only until I could get new sprockets and chain for it.