Warning, potentially (really) dumb chain question ahead. - BMW G310 R/GS Forum
 1Likes
  • 1 Post By hommes
 
LinkBack Thread Tools
post #1 of 9 (permalink) Old 06-24-2019, 11:21 AM Thread Starter
Junior Member
 
Join Date: Jun 2019
Posts: 12
Warning, potentially (really) dumb chain question ahead.

Greetings all, I'm a new owner of a 2018 GS (YEAH!). I've noticed that the chain rests on and makes contact with the hard rubber (?) cylinder attachment directly above the kick stand. I was expecting a free flow contactless path for the chain.

Question: Is the the design of the bike? Is this normal? If so, why does the chain run in contact with this part?

Thanks, and happy to be here!

Scott
bald.male is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 06-24-2019, 02:29 PM
Senior Member
 
G0MYW's Avatar
 
Join Date: Sep 2017
Location: Marlow. UK
Posts: 153
Garage
yes its designed to maintain the chain tension,
most chain drive bikes have some sort on 'guide'
Other designs are strips of nylon-type material. etc.
G0MYW is online now  
post #3 of 9 (permalink) Old 06-24-2019, 03:49 PM
Senior Member
 
Join Date: Jun 2017
Location: Netherlands
Posts: 814
Garage
Bald.male,
Welcome to the forum.
I just saw you started off quite active.
Keep up the good work.
Enjoy our threads

Ps, we’re are you from ?
Bas310 is offline  
post #4 of 9 (permalink) Old 06-24-2019, 04:23 PM Thread Starter
Junior Member
 
Join Date: Jun 2019
Posts: 12
@G0MYW , thanks I assumed it was supposed to be there. The amount of tension/friction on this part makes it a prime candidate for replacement in the not-to-distant future I suppose. I've seen guides on other bikes that seem less involved than this design.


@Bas310 thanks good to be here. I picked up a 2018 GS over the weekend with 1,000 miles and just getting to know the bike after an extended motorcycle hiatus.

Seems like a good fit for my needs out here in California wine country.

I need to get the clutch/levers dialed in better and would like to find a center stand if available. After getting to know the bike better, I'll re-evaluate and see what's next!
bald.male is offline  
post #5 of 9 (permalink) Old 06-24-2019, 05:59 PM
Member
 
hommes's Avatar
 
Join Date: Aug 2018
Posts: 53
It's more of a tensioner than a guide. It keeps enough tension on the chain around the front sprocket while allowing sufficient slack on the rest of the chain to allow for the long suspension travel. It runs on bearings so it spins with the chain.
G0MYW likes this.
hommes is offline  
post #6 of 9 (permalink) Old 08-23-2019, 10:10 PM
Member
 
Join Date: Jul 2019
Location: Palawan, Philippines
Posts: 60
Garage
On the topic of chains and in particular the tension, I (and a few other of my biking buddies) are horrified when you first see this bike of just how slack the chain looks!
So my first question is:- Is this amount of slack (40 to 50mm) normal in a bike with a long travel suspension. I recall my VStrom only having about 25mm of slack, and similar with my VFR.
And as regards the measurement.... I always assumed that you measure the slack from top of chain to top of chain, but in a YouTube video, the presenter measured from top of chain to bottom of chain! So which is correct????
Technically speaking, if you’re measuring top to bottom, if a chain is for example 8mm thick, then even if the chain was as tight as a guitar string, it would have 8mm ‘slackness’ which is ridiculous!
So.... which is correct?


Sent from my iPhone using Tapatalk
Geoff PD is online now  
post #7 of 9 (permalink) Old 08-24-2019, 09:05 AM
PCV
Member
 
Join Date: Mar 2019
Location: Scotland
Posts: 74
Strictly speaking centre to centre is correct but, for all the fractional difference, top to top or bottom to bottom will do. I don't mess about with rulers but make a gauge out of cardboard or plastic to measure between top and bottom so, in the case you quote, the gauge at its smallest would be 40 plus 8 and at its largest 50 plus 8.


I'll attach a photo later.
PCV is offline  
post #8 of 9 (permalink) Old 08-24-2019, 09:47 AM
PCV
Member
 
Join Date: Mar 2019
Location: Scotland
Posts: 74
Can't attach a photo and the sketch I did does not work when posted - everything moves to the left margin.

Last edited by PCV; 08-24-2019 at 09:49 AM.
PCV is offline  
post #9 of 9 (permalink) Old 08-25-2019, 08:53 AM
Member
 
Join Date: Jul 2019
Location: Palawan, Philippines
Posts: 60
Garage
Quote:
Originally Posted by PCV View Post
Strictly speaking centre to centre is correct but, for all the fractional difference, top to top or bottom to bottom will do. I don't mess about with rulers but make a gauge out of cardboard or plastic to measure between top and bottom so, in the case you quote, the gauge at its smallest would be 40 plus 8 and at its largest 50 plus 8.


I'll attach a photo later.


Yeh your gauge is a good idea. I’ve designed a few ‘go-no go’ test gauges during my manufacturing days so I know just what you mean.


Sent from my iPhone using Tapatalk
Geoff PD is online now  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome