Chain & Sprocket change on XC

[pinkytiff]

4k and although the chain seems fine it looks like the rear sprocket is knackered. Since a chain is still a fairly new thing for me I've a few queries!?

- I assume I need to change the rear sprocket & chain together, right?

- What about the front sprocket, do you normally change that at the same time?

- Bikes still under warranty, do I need to use BMW replacement parts?

- If not, any recommendations for suppliers please?

I reckon the 500m to EM bash finished them of but I need to get this done before an event next weekend - fingers crossed !

 

[Greg Masters]

4k and although the chain seems fine it looks like the rear sprocket is knackered. Since a chain is still a fairly new thing for me I've a few queries!?

- I assume I need to change the rear sprocket & chain together, right?

- What about the front sprocket, do you normally change that at the same time?

- Bikes still under warranty, do I need to use BMW replacement parts?

- If not, any recommendations for suppliers please?

I reckon the 500m to EM bash finished them of but I need to get this done before an event next weekend - fingers crossed !

If your rear sprocket is knackered but the chain and the front sprocket isn't, something is wrong.

The front sprocket would normally wear three to four times faster than the rear.

Greg

 

[Andy_E]

4k and although the chain seems fine it looks like the rear sprocket is knackered. Since a chain is still a fairly new thing for me I've a few queries!?

Could you post pics of the sprocket so people could get a better idea of whether it's knackered or not?

 

[pinkytiff]

Pics

Could you post pics of the sprocket so people could get a better idea of whether it's knackered or not?

I went down a tooth on the front sprocket at about 2k, so its only the rear thats done 4k.

Heres the rear one - what d'ya reckon..........?

 

[Greg Masters]

I've seen far worse but the teeth are a bit hooked.

Replace (as you've already got it off).

Greg

 

[WindyChuffer]

I can only really speak for mountain bikes, and I've found that if the cogs are fooked, then likely the chain is too.

But mountain bike shops generally have a gauge that measures the length of the chain over a number of links to determine the wear.

No idea if such a gauge is available for motorbikes. Maybe a call to a BMW to ask what the measurement is and then measure yourself with a tape measure?

 

[Greg Masters]

No idea if such a gauge is available for motorbikes. Maybe a call to a BMW to ask what the measurement is and then measure yourself with a tape measure?

24 links = 1 foot 3 inches*

Greg















*exactly

 

[Cole]

my XC came form the off-road school and they must have fitted a different rear sprocket. Mine is steel. I have put 30,000 miles on it, half on dirt, and its still OK. By contrast, I am on my 4th front sprocket and chain.

Is the OEM rear sprocket aluminium? or steel?

 

[Losttheplot]

I've not long replaced the chain and sprockets on my XC.

The original rear sprocket is alluminium, and BMW list a replacement at approx £50.

They also do a steel sprocket which i think is for the f-650(which i have now fitted) for around £30.

HTH

Nathan

 

[Cole]

The original rear sprocket is alluminium, and BMW list a replacement at approx £50.

They also do a steel sprocket which i think is for the f-650(which i have now fitted) for around £30.

The original has long slots in it, the steel one I have has round holes drilled in it. is that the same as yours?

 

[Timpo]

OK, I have looked on the JT Sprockets USA site, and no rear sprocket is listed as yet, so I have fired an enquiry into them for a part number.
The front JT part numbers are below:-

BMW 650 Xchallenge
2007 to 2008
Front Sprocket: JTF 402.16
Rear Sprocket: JTR .47 check availabilty
Recommended Chain: : 520 / 112
Front sprocket available in: 13, 14, 15, 16 teeth
Rear sprocket available in: check availabilty


Wemoto.com list an alloy rear sprocket at about £36.50.

T.

 

[Timpo]

Pinky, can you check these dimensions shown below.
They are the dimensions of a F650GS Dakar rear chainwheel.
I have looked at a yankee steel sprocket manufacturer, and they say the XC and the Dakar use the same sprockets.
If so, JT Sprockets do a steel sprocket for the Dakar and the part number is:- JTR5.#
thus # = number of teeth ranging from 39, 41, 43, 44, 45, 47, 49 teeth.
JT Sprockets are available from several outlets is UK.

And as a rule, I change the chain and front sprocket twice to each rear sprocket.

 

[Gaz]

Talon do front sprockets:-

-----------------------------
Thank you for your E-mail. I have spoken to Scott in the Sprocket Department who confirms the following information:

BMW G 650 X Challenge
1 x TG302 x 13T - Front Talon sprocket - £6.00p each + VAT - IN STOCK

Please note the delivery times for the above sprocket will be approximately 3-5 days from the date of order as the above sprocket is currently available in stock and the carriage charge will be approximately £2.00p + VAT for mainland UK.

If you have any queries regarding the above or wish to place an order then please do not hesitate to contact me.

I look forward to hearing from you.

Many thanks



Justine Richards

TALON ENGINEERING LTD
44 LYNX TRADING ESTATE
YEOVIL
SOMERSET
BA20 2NZ

Tel No: 0044 (0) 1935 471508
Fax No: 0044 (0) 1935 431825
E-Mail: [email protected]
_________________________________

 

[JohnnyBoxer]

As Gaz says................

Talon

Got my 48t rear from them, gold anodised alloy asnd 14t front from them too

Split link or rivetted .......................for the chain

 

[Timpo]

gold anodised alloy.....

Flash twat........

T.

 

[JohnnyBoxer]

Flash twat........

T.

Not fitted yet though

4000 miles and the original C&S seem ok

 

[Timpo]

.....
4000 miles and the original C&S seem ok

No Welsh bog then JohnnyB......
I'll change that in March dude.......

Timpo.

 

[JohnnyBoxer]

No Welsh bog then JohnnyB......
I'll change that in March dude.......

Timpo.

Last time I was in Wales riding with you...........it shagged me good and proper.........................but the C&S were fine

Roll on MMM

 

[Timpo]

JT Sprockets......I have fired an enquiry into them for a part number.

Reply:-

Hello Timpo

We will shortly be putting the G650X sprockets into production. Our part number will be JTR9-47 in steel, and JTA9-47 in alloy, with the possibility of alternative sizes later.

I would estimate that these items will be available within the next two months.

Sorry I cannot be more help at this time.

Regards,

Jim Irwin

 

[pinkytiff]

Pinky, can you check these dimensions shown below.
They are the dimensions of a F650GS Dakar rear chainwheel.
I have looked at a yankee steel sprocket manufacturer, and they say the XC and the Dakar use the same sprockets.
If so, JT Sprockets do a steel sprocket for the Dakar and the part number is:- JTR5.#
thus # = number of teeth ranging from 39, 41, 43, 44, 45, 47, 49 teeth.
JT Sprockets are available from several outlets is UK.

And as a rule, I change the chain and front sprocket twice to each rear sprocket.

Hi Timpo, just seen this post & I'm not sure if you still need the dimensions?