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post #1 of 12 (permalink) Old 04-19-2017, 05:06 PM Thread Starter
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Need assessment of these sprockets

I've been considering dropping the front sprocket of my GT down to 18 teeth. I bought the bike with 18k miles and it now has 24k miles so I figured it was time. The wear on the sprockets is not what I expected and I have no frame of reference. Attachments are a little blurry, I'm wondering if the previous owner has already done a chain/sprocket replacement. Chain is about 1mm shy of its max recommended spec of 321mm for 20 links. I'm wondering if I can get away with a front sprocket change, or should I just be safe and swap out everything.
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post #2 of 12 (permalink) Old 04-19-2017, 05:47 PM
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My thought? Sprockets are cheap. Buy new ones.
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post #3 of 12 (permalink) Old 04-19-2017, 06:17 PM
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Those sprockets look barely worn. I doubt they are the original set. My new rear sprocket wasn't cheap, but since you want to change out the front, I would also do the rear. No need to look back or second guess your decision to go new.
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post #4 of 12 (permalink) Old 04-20-2017, 01:24 AM
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For $20, I'd swap the front now and do the rest when the chain goes out of spec if that happens within, say, the next 10k miles. If the chain lasts longer than that, then I'd do everything next time around.

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post #5 of 12 (permalink) Old 04-20-2017, 05:09 AM
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Be aware that by reducing the front sprocket to less teeth you will put more wear on the top rubber wear strip on the top of the swing arm.

If you want lower gearing on a Sprint RS, ST or GT or a Daytona 955i it is probably better to increase the number of teeth on the on the rear sprocket.

Cheers
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post #6 of 12 (permalink) Old 04-20-2017, 08:17 AM
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That front sprocket won't be the original, It would be worse than that. I replace the fronts at 15k miles, then the full set when the chain is worn at 30k miles.

Your chain sounds like it's on its last legs though, so best to replace the full set shortly. Like DaveM says, best go up 2 or 3 teeth on the rear.

Use gearing commander to check the best combination of teeth & links to avoid excess wear, 19/45 looks good.

http://www.gearingcommander.com/
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post #7 of 12 (permalink) Old 04-20-2017, 08:57 AM
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Would you even have enough adjustment left if you put on a smaller front sprocket ?
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post #8 of 12 (permalink) Old 04-20-2017, 09:53 AM
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I dunno. Those sprockets look 'wallered out' to me.

Like MHS said, sprockets are cheap. Buy a complete chain and sprocket set and get that warm fuzzy feeling.

There are several threads on sprocket setups in this forum, so you can (maybe) figure out which way you want to go with 'gearing'.
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post #9 of 12 (permalink) Old 04-20-2017, 10:30 AM Thread Starter
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Thanks guys, the info really helps... except for that gearing commander website. That's the kind of place I'll get stuck playing with numbers for hours!
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post #10 of 12 (permalink) Old 04-21-2017, 04:51 AM
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Quote:
Originally Posted by DaveM
Be aware that by reducing the front sprocket to less teeth you will put more wear on the top rubber wear strip on the top of the swing arm.
This is true as a general rule, but going from the stock 19 down to the originally stock for first year STs 18 is not a big deal and won't do much to increase rubbing strip wear.

I see a little bit of wear on that front sprocket, but the rear still looks practically new to me. 1mm of stretch is actually a fair bit of wear on a steel chain.

Cheers,
-Kit

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