[chawness]

Hello all. I am new to this forum. I bought my first RC51 back in June. Its the 4th bike I've owned (second sport bike). It already has the 15/41 sprocket setup. How can I tell if it is a 520 or 530 chain? Reason for asking is I want to order a 42T rear sprocket but dont know what size to get.

Thanks in advance
Steve
A home built 1948 Ford F-1 Pickup truck, garage pics! 1948 FORD TRUCK

[Baketech]

Measure the length of the rollers. (distance between the inner plates)

If it's ~3/8", you have a 530. - (derived from 3/8")
If it's ~1/4", you have a 520. - (derived from 2/8")



Nice truck and workshop....

[chawness]

Thanks, that is just what I needed! Looks like it is still a 530. I guess when the last owner changed to the 15/41 gearing he opted to stay with the 530 chain size. Maybe it will hold up better in the long run...

Oh, and thanks for the compliments on the garage!

Steve

[Pete]

Originally Posted by chawness

I guess when the last owner changed to the 15/41 gearing he opted to stay with the 530 chain size.

One of the benefits of the 15/41 conversion is that the chain length stays roughly the same as stock, so you don't have to buy a new chain if you don't need/want to. Going from a 530 to a 520 offers no discernible advantages in terms of unsprung weight or reciprocating mass for anyone other than real racers, IMO.

[chawness]

If I do go to a 42T rear, will the stock chain still fit with the 15T on the front? (assuming it still has the stock chain).

[Rigor]

Originally Posted by Pete

Going from a 530 to a 520 offers no discernible advantages in terms of unsprung weight or reciprocating mass for anyone other than real racers, IMO.

One pound of weight loss, is one pound of weight loss. Agreed, though, it doesn't change your life or can you even feel it.


Yes.....15/42 fits under a stock chain.

[chawness]

Does anyone happen to have a halfway decent 42T (530) they'd like to sell?

[seamus]

I clicked the cop link out of curiosity. And you got repped for it.