Street Twin Chain Is Really Close To Tire

6mm doesn’t sound right! Have you got oversized tyres perhaps?

I can’t check mine until late December (Covid permitting) but here’s the closest photo I have of the chain/tyre.

 

I guess the only other thing to check is the wheel alignment. Hopefully someone else here with a Street Twin or Cup will be able to check their distances.

 

Tiffany Taylor
Yes check the wheel alignment. And do check they put the spacers back on the right side. What tyre are you running now as tyres do differ sometimes. Do check your manual for tire size and check it against the tire fitted. Don't just take the fitters suggestion as they are just making money from you.
Joe.

 

Tiffany Taylor.
Not sure about that space. I have got a 170 profile on my Bonnie and the space is about the same if not slightly more and i don't understand why the guard doesn't cover the chain. Have you checked the wheel alignment. If you have a centre stand get up and check it properly and let us know how you get on. If you are going to a Triumph Dealer get them to pull up the rear wheel schematic and see if something is missing there.
Joe.

 

I wonder if the wrong spacer has been put in behind the sprocket and hence the chain is running closer to the tyre? As you’ve ridden the bike it would seem that the brake disc lines up correctly and the wheel rotates fine so I’d guess that all the spacers are in there, just maybe the one behind the sprocket is wrong.

 

Could the sprocket have been taken off and put back on the wrong way ?
Odd but you never know, it's the kind of thing that I'd do.

 

Bet you sometimes put your pants on backwards too
Edit, pants =undies this side of the pond

 

Yeah, usually when I've got my cape on.

 

For what it’s worth the clearance on my Thruxton R is only about 5mm with Bridgestone Btx fitted (2nd replacement rear tyre). Never seen any signs of chain to tyre contact. I suspect tyre variation is the reason for any reduction in the clearance.

 

Photo attached of the chain run on my 2019 Street Twin yes the chain does run close to the tyre, there isn't any spacer between the sprocket and wheel, that is taken up with the cush drive. The spacer is between the sprocket and swinging arm so would not have any effect on the tyre/chain distance.
I suspect that the only reason is the tyre itself and the nature of the tread

 

Have you actually had the rear wheel out in order to make this statement?
There is definitely a spacer behind the sprocket, I’ve repaired a puncture on a friend’s T120, same set up as the street twin, and there is a spacer in there, otherwise the bearing in the sprocket carrier would collapse when the axle bolt is tightened up.

 

I noticed exactly the same on my Thruxton R which is fitted with the original Rosso Diablo tyres and its VERY close to the chain. I have had the alignment checked (for other reasons), and it was out, but realigning it hasn't provided any more space. I guess that's just how it is, but it does look awfully close
Mike

 

Hi Tiffany, I have only just seen your post, firstly the Continental TKC70 Dual Sport Tyre you have on your machine has a slightly wider edge profile (in effect making it closer to the chain run), I very much doubt it is anything to do with the spacer, the reason I say this is for example if say the spacer was missing, or incorrectly fitted then what takes place is the swing arm would catch on the hub when the axle nut was torqued up, and the rear wheel would be extremely difficult to rotate, if you look at the profile of your original tyre and compare it to the TKC70 you will see the difference, if your chain became very slack then yes it could well come into contact with the tyre sidewall, a slack chain actually moves "sideways" under load, it may sound obvious but incorrectly re adjusting the chain after the wheel was re installed with the new tyre, would effectively draw the tyre closer to the chain, I have seen tyre fitters who have adjusted rear wheels and have been as much as 15mm out, often some are that busy(or careless) they seem to look at the swing arm markings and think "ah that's near enough it twill do". Keep the forum posted on how things progress.