Triumphrat

RonD · 02-27-2008

Hi guys iam new to this part of the forum and i own several old classic bikes, but my latest bike is a Tiger 100 1951 model with a sprung hub, never had a bike with a sprung hub and was wondering is there anyone out there with one.
what I would like to know is the rear chain adjustment, or how much slack to adjust into the chain?

kiwilarry · 02-27-2008

I used to ride these Triumphs in the '50's (1950 Thunderbird 6T which I still have, but don't ride) so should remember, and I think it was 1.5" but will search out a manual for the models (I have somewhere!) and get back to you. I seem to recall the chain length didn't change much as the vertical movement was only 2" or 3" or so total up and down movement (if you were lucky)

RonD · 02-27-2008

Thanks Larry much appreciated..

kiwilarry · 02-27-2008

But the way the system works, the axle remains fixed in the rigid frame, and the wheel hub moves vertically in a straight line (like a plunger type rear end) not an arc (which would keep the chain length constant) so I imagine the chain must need slack to accommodate this as well. I will check out my 6T when I go to where it's stored and report back. Maybe tomorrow. Cheers.

GrandPaulZ · 02-29-2008

No, it is ever-so-slightly an arc.

I would go with a minimal amount of chain slack. It ain't going far!

RonD · 02-29-2008

thanks Paul it makes sense that there should be minimum slack on the chain as it is a semi regid design, but it would be interesting to find someone with one and get some accurate information..

terry9 · 03-02-2008

I have a 48 Tiger 100, Mk1 sprung hub, and a 52 6T, Mk11 sprung hub, and to set the rear chain to proper slack the book says - "The adjustment of both chains should be such that there is half an inch free up and down movement mid-way between sprockets."

Also make sure that when you are moving the rear wheel that you move the adjusters equaly to keep the wheel in line.

RonD · 03-02-2008

Terry I will adjust mine the same thanks for your reply regards Ron..

oldebonnie · 03-04-2008

At the risk of stating the obvious, if you adjust the chain adjusters equally, you are preserving the situation, but if it is misaligned in the first place, you are preserving the misalignment. I suggest you take the opportunity to check the alignment, and make adjustments as necessary.

RonD · 03-04-2008

your right oldbonnie i always align the the wheels with a string line ..