Double Single to Triplex Primary Opinions Please

Rockitdoc

Rockitdoc

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Location
Fort Collins, Colorado
My RGS1000SFC has two single chains on the primary drive.  If the sprockets and chain are not worn out, is there a compelling reason to change to a triplex chain and sprockets?

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S
 
.... and just to expand on that.  It is extremely unlikely that you can now purchase a triplex chain of sufficient quality for this application. Using poor quality /industrial grade chain will result in its -  potentially catastrophic - failure.

There have been many threads on this subject.
 
The sprockets need a million miles, or something disastrous happening inside the case, to wear out... replace the 2 chains and stop worrying.

I can supply triplex chains in excellent DID quality if required.  :D

piet
 
Rockitdoc said:
is there a compelling reason to change to a triplex chain and sprockets?
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Not only is it quite acceptable to go with the 2 simplex chains (modern ones are far stronger than they used to be), if your sprockets have been used for a significant number of km then the middle one will be less worn, and putting a triplex chain on could cause the middle row to be put under excessive strain and cause it to fail. Threads on this too. What is too much wear? Nobody really knows. Stick with the simplexes, or go with a duplex Mercedes cam chain.

Ken
 
mcnicol said:
Not only is it quite acceptable to go with the 2 simplex chains (modern ones are far stronger than they used to be), if your sprockets have been used for a significant number of km then the middle one will be less worn, and putting a triplex chain on could cause the middle row to be put under excessive strain and cause it to fail. Threads on this too. What is too much wear? Nobody really knows. Stick with the simplexes, or go with a duplex Mercedes cam chain.

Ken
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Ken, being the later SFC unit he has no middle teeth on his sprockets so he has to use single chains or replace everything
stay with the singles

 
Odometer shows about 3500 km.  No way to know if it's correct.  Should I just replace the chains to be safe?  They 'look' fine, but I don't know what they should 'look' like anyway.

 
Don't seem to have a third row of teeth on the clutch sprocket, so that should make the decision easier. Might be a good idea to get a new crank lock washer while your about it.
 
Cosi said:
Depends on how much you enjoy sleeping peacefully

Piece of mind is a wonderful thing
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Well, I am glad that's off your chest.  Giving someone a Piece of mind can give you Peace of mind, sometimes!!. :D

 
My brother's 3C has done around 100,000km at best guess (speedo wasn't working for several years). It still has the original Regina triplex chain that it came with in 1975. I measured it for stretch a couple of years ago and it was fuck-all. I had replacement alternatives available, but Tim decided to leave the original in there rather than replace it. To be honest, the original looked better than the replacements I had available (before Andy's Merc duplex was available). We only replaced the cam chain a couple of weeks ago when we did the head gasket because it did have a wee bit of stretch. The new cam chain didn't look nearly as robust as the original Regina big pin chain.

Seems the original chains will go a long way if not thrashed at full throttle and high revs.
 
Dellortoman said:
My brother's 3C has done around 100,000km at best guess (speedo wasn't working for several years). It still has the original Regina triplex chain that it came with in 1975. I measured it for stretch a couple of years ago and it was fuck-all. I had replacement alternatives available, but Tim decided to leave the original in there rather than replace it. To be honest, the original looked better than the replacements I had available (before Andy's Merc duplex was available). We only replaced the cam chain a couple of weeks ago when we did the head gasket because it did have a wee bit of stretch. The new cam chain didn't look nearly as robust as the original Regina big pin chain.

Seems the original chains will go a long way if not thrashed at full throttle and high revs.
Click to expand...

Yeah, straight through the clutch cover in some cases... :D

Still finding original Reginas, owners often don't believe their bikes could run so quietly after a new chain has been fitted!

piet
 
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