Sprocket Size? - 2018 KTM 790 Duke Forum
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post #1 of 18 (permalink) Old 01-17-2020, 09:32 AM Thread Starter
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Sprocket Size?

Anyone use +2 on the rear? Is chain long enough? Or -1 in front, any rubbing issues?
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post #2 of 18 (permalink) Old 01-17-2020, 10:15 AM
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In German - but there seems to be a few who've dropped a front tooth. https://www.ktmforum.eu/forum/thread...-15-er-ritzel/

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post #3 of 18 (permalink) Old 01-17-2020, 10:19 AM
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Originally Posted by Talber8 View Post
Anyone use +2 on the rear? Is chain long enough? Or -1 in front, any rubbing issues?
Hello there and Welcome to the Team..!

I've never had an issue going up 2 teeth on any of the dozens of motos owned.

I'd rather go up 2 teeth in the back, than down 1 in the front, (which is closer to 2.5 in the rear, iirc).

But of course, this depends on what sort of riding you're looking to do.

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post #4 of 18 (permalink) Old 01-17-2020, 11:54 AM

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I dropped a tooth on the front and it was the best $25 I've ever spent on a bike upgrade.

No issues with clearance or fitment - very simple swap out from the stock unit. Very little geometry change as well so no need to adjust ride height or anything at least for my tastes.

The gearing commander website said it lowers top speed by roughly 12kph which is no issue for me - 225kph down to 213kph or whatever it is.
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post #5 of 18 (permalink) Old 01-17-2020, 03:42 PM
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Of course you can always add the 56tooth rear from Rok Bagoros too. If you want to!.

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post #6 of 18 (permalink) Old 01-17-2020, 07:23 PM
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Hi .well it is a small world .

Have got the genuine powerparts KTM (orange) standard sized rear sprocket fitted with the orange chain .

After experiencing a few heavy/ traffic ,filtering episodes ( clutch slip to control poor low speed engine running )

Decided to change the drive sprocket X1 teeth lower to see if it would help .

Glad to say yes it did ,slow speed response & filtering in heavy traffic much better .

loss of top speed no real difference felt as the bike has no fairing protection .over say 70 mph+ ? On uk roads with wide bars you start to hang on anyhow ..

Found it a worthwhile exercise & cost of the front drive gear / ease of fitting negligble *
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post #7 of 18 (permalink) Old 01-18-2020, 04:16 AM
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It's already something I've been considering - but when I have to change the chain/sprockets anyway. For now I'll just stay a gear lower.
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post #8 of 18 (permalink) Old 03-11-2020, 10:42 AM Thread Starter
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I ended up going -1 in front and it is significantly better 30-40mph. I’m tempted to go +1 in rear too!
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post #9 of 18 (permalink) Old 03-12-2020, 07:11 AM
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My wife runs a 790 duke, we changed the rear to a +2 teeth, makes a really nice differance and the bike is a lot better in traffic. The standard chain isnt long enough though, even with the block turned round. I would recommend it over the front, more expensive but easier on the chain, and wear increasing on the swingarm.
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post #10 of 18 (permalink) Old 03-12-2020, 07:55 AM
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I ordered sizes 39-42 to play with. We have a variety of tracks to ride so the gearing will change with each track I am sure. I will also try +1,-1 on the front.
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