Tyre Selection 1974 commando

Fast Eddie said:

Aren‘t the BT45s / BT46s dual compound ?

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It seems to suggest they are single compound (BT46)
On 19" by 2.5" rims two fronts could most likely be used (reversed on the rear)

The TT 100s universal 100/90/19 list tread depth as 9/32". This is equal to 7.15 mm, close to Avon dedicated rear (400x18 etc) at 7.5mm.
It's a whole lot greater than the Avon roadrider universal depth of 5.6 mm.
I might try one one the rear next time to see if it will do a bit better than the Roadrider Universal.
Unfortunately I just fitted a new 100/90/19 rear yesterday. But it won't last long!

Glen

worntorn said:

The TT 100s universal 100/90/19 list tread depth as 9/32". This is equal to 7.15 mm, close to Avon dedicated rear (400x18 etc) at 7.5mm.
It's a whole lot greater than the Avon roadrider universal depth of 5.6 mm.
I might try one one the rear next time to see if it will do a bit better than the Roadrider Universal.
Unfortunately I just fitted a new 100/90/19 rear yesterday. But it won't last long!

Glen

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I just had a new set of TT100s on mine. The previous had 3,500 miles on them and, whilst the rear was starting to look slightly squared, they had plenty left and rode fine. I only changed them for peace of mind and because they were old. Maybe a 23T sprocket helps tyre mileage.

Had to go back to the garage though, the front had been put on the wrong way round.

worntorn said:

The TT 100s universal 100/90/19 list tread depth as 9/32". This is equal to 7.15 mm, close to Avon dedicated rear (400x18 etc) at 7.5mm.
It's a whole lot greater than the Avon roadrider universal depth of 5.6 mm.
I might try one one the rear next time to see if it will do a bit better than the Roadrider Universal.
Unfortunately I just fitted a new 100/90/19 rear yesterday. But it won't last long!

Glen

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The 19” Road Runners are universal and have 7mm tread. Suitable for a 1.85” rim too according to Avon.

Good to know, now we are up to a whopping 3 tire choices for those of us with wider rims and 2 for those with stock rims.
I used to run the 4.10 x19 am9 on the Vincent rear and they did ok.
They were a bit overloaded with 2 up , although at 61 they do have a heavier weight rating than the Roadrider 100/90/19 (57).
After the switch to 18" rear rim & Roadriders on the Vin, I totally forgot about the Am9 for the 19" Commando rims.
They are a skinny little tire as I recall.
From a cosmetic standpoint, the 400 x 18 Roadrider looks right on the Commando rear.
Oh well, if my rear rim ever gets damaged it will be replace by a 2.5"x 18". Central Wheel did not have them in MK3 pattern and thought they were about a year off.
They offer them now.

Glen

From my experience I am led to believe that Dunlop have 3 factories that produce TT100's France USA & Indonesia, TT100 were manufactured in Japan up to aprox 10 years ago, for Australasia most appear to come from Indonesia. For you guys in USA & UK I suspect that your tyres may be manufactured in USA or France. To my knowledge [from the catalogues I have seen the 100/90x19 TT100 is only available in GP compound [softer for Racing] the 410x19 TT100 is normal for road use, the 100/90x19GP is only slightly narrower than the 410 and being slightly softer [in my view] makes a good option for front fitment, on the rear they don't last long! as stated I had that combination fitted to my previous 850.

Hi Al,

Not a GP but my front is a 3.60 TT100, marked as Japan made and dated 1020 if i read the codes correclty. Fitted prior to the Raincliff trip. My 4.10 rear is Indonesian.

I cannot find any Continental rear tyres in 100/90/19".
That size is shown as "Discontinued"

Glen

That's interesting Ian I will have a look at the Fastback & 650SS which both have 360x19's on them but i suspect they will be about 10 years old. It's been 5 years since I worked in the Trade.