Author Topic: Chain length  (Read 3822 times)

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jwhite2

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Chain length
« on: December 06, 2010, 08:21:14 AM »
Whats the chain length on a MKII RS?

Thanks

Offline scrambler

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Re: Chain length
« Reply #1 on: December 06, 2010, 08:31:37 AM »
the 175 - 200 manual says 428-106 for the RS and 428-108 for the SS (also DT & HS). This would be for stock sprockets, any changes along the way may mean that you have a longer or shorter chain.

Driven sprocket 36T - RS
Driven Sprocket 38T - SS, HS, DT

Drive Sprocket 15T - HS
Drive Sprocket 16T - DT, RS, ss

jwhite2

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Re: Chain length
« Reply #2 on: December 06, 2010, 08:45:35 AM »
I havent changed any sprockets so looks like 106 is the lucky number!  Thanks a ton!

Offline jjwithers

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Re: Chain length
« Reply #3 on: September 24, 2016, 07:10:47 PM »
I am going to resurrect an old thread.

My Bridgestone 175HS has two rear sprockets.  The original chain was mounted on the small, inner sprocket. 
I purchased a 428-136 chain and removed enough links to make it a 110 (i figured I would remove another link if necessary but better to remove too little then too many). 
The outer dimension of the new chain measures 21.5mm (the width of the link fro pin to pin) but the original chain measures about 16.34mm... ask me how I figured this out... (yes, i went to mount it on the bike only to find that it doesn't fit).
The new chain is one of those self lubricating/sealed fancy chains.  Maybe that was my mistake?
So....
Anybody want to buy one of those fancy Heavy Duty sealed chains? It would work if you don't have the double rear sprockets like my HS.
And...
What kind of chain would work for my set up?  I need something closer to my stock size.  Unfortunately, nobody advertises the outer dimensions and the photos on motorcycle online stores are terrible. 

You can see in the photo that the new gold chain is much wider. 


1967 175 HS
and some BMW's from the 60's and 70's

Offline OldSwartout

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Re: Chain length
« Reply #4 on: September 25, 2016, 09:14:59 AM »
Any standard 428 chain should be satisfactory, they'll all be very similar in width.
There are some heavy duty 428's that are a little wider overall due to heavier side plates, but nothing like that o-ring chain.  I've never seen an HS with dual rear sprockets. Does it look like someone adapted the 90/100 Trail and Mountain setup shown in the 90/100 Parts Catalog?
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline jjwithers

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Re: Chain length
« Reply #5 on: October 01, 2016, 10:21:54 PM »
Here is a photo of my double sprocket.  It is one of the alluring features that made me buy this bike to begin with.

1967 175 HS
and some BMW's from the 60's and 70's

Offline OldSwartout

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Re: Chain length
« Reply #6 on: October 02, 2016, 08:33:36 AM »
That's pretty wild, the bike should be a real stump puller.  The stock rear sprocket is a 34 T (I think); it looks like the smaller one on yours is around 48 T and the larger about 60 T.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline mqtsteve

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Re: Chain length
« Reply #7 on: October 02, 2016, 09:34:32 AM »
It doesn't look like it's from the BS90 Mountain or Trail.  They have 34 tooth small sprocket and 64/47 tooth large sprocket respectively.  Another mystery innovation?  Good luck, Steve
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline jjwithers

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Re: Chain length
« Reply #8 on: October 02, 2016, 11:59:38 AM »
Yea, i thought it was odd but really liked the look.  The bike will become a street bike but you can see that the sprockets were built into the rear hub.
1967 175 HS
and some BMW's from the 60's and 70's

Offline mqtsteve

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Re: Chain length
« Reply #9 on: October 03, 2016, 06:48:56 AM »
The cush-drive hub looks like the stock 90 trail/mountain hub.  The sprockets are custom.  Looks like someone modified the gear ratio.  Makes me wonder what the bike was used for?  It's too bad the history of these machines gets lost.  I own four BS90's.  All but one were customized slightly.  My mountain only has one 34 tooth rear chain ring.  The swing arm was not modified.  The previous owner just tightened the axl nut until it bent in enough to hold tight!  I tried attaching a photo but can't due to formatting problem.
Steve S.
4/1966 BS90 Sport(o.i.), 5/1966 BS90 Sport(o.i.),
1965 BS90 Trail, 1965 BS90 Mountain

Offline OldSwartout

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Re: Chain length
« Reply #10 on: October 03, 2016, 09:04:39 AM »
That appears to me to be the stock early version of the 175 rear hub and probably hasn't been modified. You should be able to just swap to a stock rear sprocket when you want to.  Your top speed at 9000 rpm will be about 50 MPH with the smaller sprocket and less with the larger.
« Last Edit: October 03, 2016, 09:12:58 AM by OldSwartout »
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

Offline jjwithers

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Re: Chain length
« Reply #11 on: October 03, 2016, 12:33:55 PM »
Yea, i figured that larger sprocket was for hill climbing or something needing the torque.   I too would love to know the history... and thanks for bringing to light my lower MPH even with the smaller sprocket.  I do think stock (even smaller) might be better for more speed.  Anybody got one lying around to sell?

That appears to me to be the stock early version of the 175 rear hub and probably hasn't been modified. You should be able to just swap to a stock rear sprocket when you want to.  Your top speed at 9000 rpm will be about 50 MPH with the smaller sprocket and less with the larger.
1967 175 HS
and some BMW's from the 60's and 70's

 


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