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Discussion Starter #1
Hi,

Has anyone was able to source smaller front sprocket for gs? or larger rear sprocket? I cannot find any information so far...
 

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Sprockets for G310GS

I just installed a 15 tooth front sprocket and a 43 tooth rear. I purchased the front from KHS bicycle parts for approx. $30. They purchase the sprockets from a European company then distribute them when they have them available. The rear I purchased from Sprocket Specialists for approx. $40. The difference I noted is as follows, all RPM'S and Speeds were recorded in 6th gear:
10k rpm = 90 mph
9k rpm = 81 mph
8k rpm = 72 mph
7k rpm = 64 mph
6k rpm = 56 mph
 

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I just installed a 15 tooth front sprocket and a 43 tooth rear. I purchased the front from KHS bicycle parts for approx. $30. They purchase the sprockets from a European company then distribute them when they have them available. The rear I purchased from Sprocket Specialists for approx. $40. The difference I noted is as follows, all RPM'S and Speeds were recorded in 6th gear:
10k rpm = 90 mph
9k rpm = 81 mph
8k rpm = 72 mph
7k rpm = 64 mph
6k rpm = 56 mph
Do you know if the sprockets are semi generic as in fitting other makes/models? If so which?
Or the name of the European company?
 

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To have lower revs at the highway; I would love to have an 17T front sprocket.
But that would probably not fit. 0:)

According to Ebay it would be possible to fit -1 at the rear.
And according to the compatibility list, the Aprilia Pegaso and BMW 650F had the same fitment.
I guess seeking a few minutes and an -3 will be found.
 

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Discussion Starter #10

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I just installed a 15 tooth front sprocket and a 43 tooth rear. I purchased the front from KHS bicycle parts for approx. $30. They purchase the sprockets from a European company then distribute them when they have them available. The rear I purchased from Sprocket Specialists for approx. $40. The difference I noted is as follows, all RPM'S and Speeds were recorded in 6th gear:
10k rpm = 90 mph
9k rpm = 81 mph
8k rpm = 72 mph
7k rpm = 64 mph
6k rpm = 56 mph
Hi.
Did you have to extend the chain with your 15 - 43 combo?
 

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Discussion Starter #12
15/43 combo should not require changing the chain.
 

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To have lower revs at the highway; I would love to have an 17T front sprocket.
But that would probably not fit. /forum/images/G310Rforum/smilies/tango_face_angel.png

According to Ebay it would be possible to fit -1 at the rear.
And according to the compatibility list, the Aprilia Pegaso and BMW 650F had the same fitment.
Hi Worldbeater, i also search for sprockets to lower my g310r rpms, but there is nothing made for us.
You can get rear sprocket -1, but its very small change. And there is no space for -2 rear sprocket, as the chain would start to grind rear hub.
Only solution is 17T or 18T front sprocket but no one makes them yet. Maybe we should write to https://www.esjot.com/en/contact/
And ask them to make some. They are making 15 and 16T already so why not 17, 18T?
 

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Discussion Starter #14
Thank you for the information. I will order that one. I also ordered bigger rear sprocket from https://www.supersproxusa.com/products.php?cat=1126159

but as it is 46T (equivalent to 14T on the front) I might need to fit longer chain.

I have the same 46T rear sprocket, but since the chain needs to be changed, I decided to go for a different set up - 15T front and 43 rear. I think that the original chain can be used?

I got the sprockets from this company which looks very professional: https://www.biketeile-service.de/BMW-G-310-83459/en/transmission/chaindrive/rearsprocket/standardgearing/rearsprocket43toothpitch520jtr543.html
 

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Hi,

Has anyone was able to source smaller front sprocket for gs? or larger rear sprocket? I cannot find any information so far...
Buy the 15 tooth sprocket from carpimoto. The part number is 50-32184-15S. This is the best improvement I've made with my G310GS; no longer killing it on take off and it will still go 90 mph but at 9500 rpm.
 

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There are 17 tooth sprockets sold by BMW in many countries. They do not make them available in the USA. You may be able to find one in another country.
 

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I got a 15 T front sprocket from here: https://brooksbarn.com/en/category/10100000000/vehicle/bmw-g-310:83459/article/758036/
Took about 2 weeks to receive it. Looks better than stock.

That's a bargain price😊. My GS had its 6,000 mile service on Saturday and apparently both front and rear sprockets were "stretching"; no mention of chain condition. I found it alarming that a BMW dealer was prepared to display such technical incompetence in writing. I'd put the photo of the diagnosis on here as it probably won't be believed, but I don't have the technology.


Anyway, the quote for new chain and sprockets, at £345 plus labour, was only three times the cost of the dearest top spec kit I could find elsewhere.


Guess where the bike won't be going next time, assuming it is still in the warranty period by then.
 

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That's a bargain price😊. My GS had its 6,000 mile service on Saturday and apparently both front and rear sprockets were "stretching"; no mention of chain condition. I found it alarming that a BMW dealer was prepared to display such technical incompetence in writing. I'd put the photo of the diagnosis on here as it probably won't be believed, but I don't have the technology.
Pictures of a "stretched sprocket" please.

Mostly because I don't believe this is thing at all, not least with a 300cc at 6000 miles. I'd bet the sprocket teeth are still running in and still pretty square, the sprocket in no way "stretched."

I am with you on the dealership bring incompetent, that's pretty horrible, embarrassing.

Your chain has probably stretched a little as is normal and it should. I would be quite impressed if it wasn't within the normal adjustment range.
 

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Exactly. Leaving aside the physical impossibility of stretching, the sprockets are OK, chain has required one initial adjustment, as would be expected, and has always had the benefit of a Scottoiler.



Whilst a single might be harder on chains I expect (subject to the quality of the original chain; Indian?) it to be a long time before significant wear occurs. My SV, similarly equipped with a Scottoiler, had a perfectly functioning chain and sprockets that had done near 40,000 miles when I sold it. I put the need to replace the original at 18,000 down to the transmission running out of line for the first while due to the shoulder on the rear sprocket being incorrect from the factory.
 
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