Rear Sprocket Size

[Rugman29]

So I am ready to purchase a new chain and sprockets. I have a 2001 Katana 750 and am unsure of the original size of the rear sprocket. It currently has a 15 front and 47 rear. When I research sprocket size online, it says could have either came from the factory with a 45 or 47. How do I know which one? Also, I plan on going with a DiD X Ring Gold 530 chain but unsure of where the best place (and price) to purchase the sprockets.
Thanks

[steves]

15/47 is an excellent choice of gearing.

last I checked, eBay had the best prices on the DID chains. Be careful installing the master link as they use a steel pin not bronze and it will shatter if you over rivet it.

I have 15/47 sprocket sets in stock in the KR store ready to go.

[Kreylyn]

So I am ready to purchase a new chain and sprockets. I have a 2001 Katana 750 and am unsure of the original size of the rear sprocket. It currently has a 15 front and 47 rear. When I research sprocket size online, it says could have either came from the factory with a 45 or 47. How do I know which one? Also, I plan on going with a DiD X Ring Gold 530 chain but unsure of where the best place (and price) to purchase the sprockets.
Thanks

Umm...

could have either came from the factory with a 45 or 47. How do I know which one? It currently has a 15 front and 47 rear.

You know you answered your own question right...

Krey

[arsenic]

600 = 47, 750 = 45.

[Rugman29]

If I was sure that the rear sprocket was the original one, then I would say it came with a 47 rear but I have only owned the bike for like 9 months.
It does have 39,000 Km (23,000 Mi) on it and not sure what the PO did.

[cintidude04]

Arsenic is correct, from my research the 750's came stock with 45 rear with 47 being consider a good upgrade.

[Kreylyn]

When I research sprocket size online, it says could have either came from the factory with a 45 or 47.

This statement is 100% correct.

Krey

[cintidude04]

I was under the impression only the pre 600's came mixed between the 45 and 47 rear sprockets, and the 750's all came 45. But I don't have a 750 so that is not the main focus when I look things up. Krey on the other hand has a 750 and is extremely knowledgeable about it. Either way, 15/47 is the way to go.

[arsenic]

The way they come from the factory entirely depends on what crap they have laying around on that day. This is a Katana after all, SS riders aren't the only people that don't care about them.

[Rugman29]

I will likely go back with the 15/47 setup. The bike also has a 160/60 rear in place of the 150/70. I wonder how far out the speedo is if it did come with the 45 tooth rear and with the different tire size?

[arsenic]

I will likely go back with the 15/47 setup. The bike also has a 160/60 rear in place of the 150/70. I wonder how far out the speedo is if it did come with the 45 tooth rear and with the different tire size?

Just use a speedo healer and than use can use any sprocket size you want and your speedo will be correct.

[steves]

It's safe to run a 160/60 on the post kat rear rim.

The error from the tire size difference is likely insignificant to the 'stock' speedo error.

[91GSX750]

I dont mean to hijack the thread, but being my question is related I figured it would be better to post it in here then start a new thread about almost the same thing...

I have a 91 750 Katana and I commute 80 miles a day round trip on the hwy for 99% of it. I would like to get the rpms down a little on the hwy so I could hopefully get better gas mileage. What sprocket combo should I switch to?

Right now at 75 mph I am at about 5700 rpm (I'm sure the speedo is off so I dont really know how fast I am going btw).

[steves]

https://www.gearingcommander.com

[91GSX750]

Thanks for the link Steves!