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Old 04-09-2013, 08:00 PM   #4636
gsstampeder
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Quote:
Originally Posted by compositeboy View Post
Hey All, Surprised to see no options for rear sprockets for my X-Challenge. Is anyone using something different than the stock 47 tooth unit? Was hoping to drop the gearing down a bit as an experiment, and since it is worn and in need of replacement. Any leads/cross references greatly appreciated.
I'm using a 14/47 and it works for me. Sometimes I reach for another gear on the slab but when I look down and see i"m doing 75-80 I'm kinda glad I don't have that 6th gear....and the gearing seems right for the trails and backroads I ride. Thought of going up to a 49 on the rear but I'm afraid that'll effect top end speed too much. I still have to ride slab to get to the good stuff.

Stephan at bashplate.de has some options and I think his prices even with shipping are pretty reasonable
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Old 04-09-2013, 09:06 PM   #4637
macadamia
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I use 15 / 49 setup and can still ride 85mph+... the nice thing about the 49 rear sprocket is the increased low end grunt when hill climbing off road. The previous owner of the bike set it up this way and I stuck with it when I replaced the sprockets last spring...

Here is a photo of what I installed last spring... I stuck with steel sprockets for the durability...
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Old 04-09-2013, 09:29 PM   #4638
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Quote:
Originally Posted by macadamia View Post
I use 15 / 49 setup and can still ride 85mph+... the nice thing about the 49 rear sprocket is the increased low end grunt when hill climbing off road. The previous owner of the bike set it up this way and I stuck with it when I replaced the sprockets last spring...

Interesting combo/ratio
14/49 = 3.50
15/49 = 3.27
14/47 = 3.36
15/47 = 3.13 (OEM)

I'm running 14/47, like the low end, but revvy at times. Might be a good compromise between what I'm running now and OEM. How does the 15/49 lug on slow technical stuff?
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Old 04-09-2013, 09:47 PM   #4639
tbarstow
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Quote:
Originally Posted by mtncrawler View Post
Interesting combo/ratio
14/49 = 3.50
15/49 = 3.27
14/47 = 3.36
15/47 = 3.13 (OEM)

I'm running 14/47, like the low end, but revvy at times. Might be a good compromise between what I'm running now and OEM. How does the 15/49 lug on slow technical stuff?
15/49 and 14/47 pretty much feel the same. I stick with the 15 front so I can run OEM sprockets. I have found that the aftermarket sprockets don't fit the splines correctly. Replacing your output shaft is big $$$$.

The 15/49 does just fine in the technical stuff.

tbarstow screwed with this post 04-09-2013 at 09:56 PM
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Old 04-09-2013, 09:50 PM   #4640
macadamia
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Quote:
Originally Posted by mtncrawler View Post
Interesting combo/ratio
14/49 = 3.50
15/49 = 3.27
14/47 = 3.36
15/47 = 3.13 (OEM)

I'm running 14/47, like the low end, but revvy at times. Might be a good compromise between what I'm running now and OEM. How does the 15/49 lug on slow technical stuff?
I have not ridden it off road since last fall, so I do not recall exactly... but from what I remember, it did just fine off road in Death Valley and in Mendocino national forest... For me, even some of the easier stuff was ridden slow and I cannot remember complaining about the engine lugging or stalling. Being pretty new off road, if I were having problems with lugging or stalling, I would have asked about it and researched how to solve it.

Maybe someone with more experience running this combo can speak up...
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Old 04-09-2013, 10:01 PM   #4641
mtncrawler
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Quote:
Originally Posted by tbarstow View Post
15/49 and 14/47 pretty much feel the same. I stick with the 15 front so I can run OEM sprockets. I have found that the aftermarket sprockets don't fit the splines correctly. Replacing your output shaft is big $$$$.
Thanks TB - when I bought the bike it had the 14/47 combo on it. I have the OEM 15T front (few miles) - bike only had 950 total miles. I'm just feeling things out right now but thought about changing back to OEM ratios just as a comparison. Being new to the X, I didn't want to jump the gun and change things, but trying the 15T would be easy, before deciding on purchasing another ratio.

Quote:
Originally Posted by macadamia View Post
I have not ridden it off road since last fall, so I do not recall exactly... but from what I remember, it did just fine off road in Death Valley and in Mendocino national forest... For me, even some of the easier stuff was ridden slow and I cannot remember complaining about the engine lugging or stalling. Being pretty new off road, if I were having problems with lugging or stalling, I would have asked about it and researched how to solve it.

Maybe someone with more experience running this combo can speak up...
Thanks mac, Good info to know - as stated above - new to the X, but have ridden lots off road on GSA and many moons ago owned a couple enduro motos like the XR/DR...
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Old 04-09-2013, 11:19 PM   #4642
Colebatch
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I replaced my rear disc with one from Scheffelmeier (the www.bashplates.de link below) a while back and its fine.



Quote:
Originally Posted by pampaX View Post
Hi guys does anybody know which other bikes have same rear disk rotors?

I found very scarce info and replacements on the net. Lots of front ones but no rears.

Found:
Dealer can get original with 3 months delay I assume they need to extract the metal out of the mine first.

Thanks
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Old 04-09-2013, 11:22 PM   #4643
snooker
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Quote:
Originally Posted by mtncrawler View Post
Interesting combo/ratio
14/49 = 3.50
15/49 = 3.27
14/47 = 3.36
15/47 = 3.13 (OEM)

I'm running 14/47, like the low end, but revvy at times. Might be a good compromise between what I'm running now and OEM. How does the 15/49 lug on slow technical stuff?
You also need to consider the chain lengths and the impacts on wear. For instance the stock chain length is 112 so 112/14=8 exactly meaning the same link always hits the same sprocket tooth every revolution so 14 is not good. Likewise on the rear, every 7 revolutions of the chain has a chain link hit the same sprocket tooth (112 * 7 = 49 * 16).

From a wear perspective alone, 15/47/112 is the sweet spot and certainly a 14 front with a 112 chain is really a pretty bad choice. For that matter the OEM was 16 and 112/16=7 exactly which is just as bad, I don't know how BMW can explain this.

Awhile back I received quite the education on this topic, which I summarized on this post: LINKY

... worth a look IMHO, especially the link to the f650 chain wear chart.
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Old 04-10-2013, 12:51 AM   #4644
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Hi Walter, thanks that's what I ended up buying (still hasn't arrived). There aren't lost of options and in the end all the bits I've bought from Stephen have been very good, so thought why not trying.

(BTW: read you sibirksy thread, it was great thanks )

Quote:
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I replaced my rear disc with one from Scheffelmeier (the www.bashplates.de link below) a while back and its fine.
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Old 04-10-2013, 02:04 AM   #4645
jonnyc21
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Quote:
Originally Posted by snooker View Post
You also need to consider the chain lengths and the impacts on wear. For instance the stock chain length is 112 so 112/14=8 exactly meaning the same link always hits the same sprocket tooth every revolution so 14 is not good. Likewise on the rear, every 7 revolutions of the chain has a chain link hit the same sprocket tooth (112 * 7 = 49 * 16).

From a wear perspective alone, 15/47/112 is the sweet spot and certainly a 14 front with a 112 chain is really a pretty bad choice. For that matter the OEM was 16 and 112/16=7 exactly which is just as bad, I don't know how BMW can explain this.

Awhile back I received quite the education on this topic, which I summarized on this post: LINKY

... worth a look IMHO, especially the link to the f650 chain wear chart.
I thought the 16/47 stock was the country and the Challenge was 15/47... learn something new every day I guess.
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Old 04-10-2013, 02:10 AM   #4646
macadamia
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Quote:
Originally Posted by jonnyc21 View Post
I thought the 16/47 stock was the country and the Challenge was 15/47... learn something new every day I guess.
your spec quote is correct...
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Old 04-10-2013, 04:33 AM   #4647
compositeboy
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Wow!

Ask and ye shall receive! Thanks all, what a great forum!

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Any leads/cross references greatly appreciated.
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Old 04-10-2013, 05:11 PM   #4648
snooker
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Originally Posted by jonnyc21 View Post
I thought the 16/47 stock was the country and the Challenge was 15/47... learn something new every day I guess.
Nope you are right, Yeah sorry I forgot I was not on the XCountry thread . I think the other points (like not using a 14 very often) are still valid but nice to see the XCh is setup "optimally" for chain wear even though they tried to give the XCountry some more highway speed I presume.
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Old 04-10-2013, 05:24 PM   #4649
tbarstow
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Originally Posted by snooker View Post
Nope you are right, Yeah sorry I forgot I was not on the XCountry thread . I think the other points (like not using a 14 very often) are still valid but nice to see the XCh is setup "optimally" for chain wear even though they tried to give the XCountry some more highway speed I presume.
Probably trying to make up for the little wheels on the XCountry.
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Old 04-13-2013, 01:53 PM   #4650
LangKat
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Thanks to all who gave advice about the jammed seat. Will try get it sorted this weekend.
Turns out the spring got knocked free; so it wasn't pulling the locking mechanism far enough back. It properly got knocked out by the pump which doesn't fit in the seat properly any more and falls out a bit.



Fixed it with a cable tie



If this ever happens to you, the trick to getting your seat off is to hook the mechanism with a piece of wire from the right hand side (key side).
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