Britbike forum Forums British Motorcycle specific Brands Triumph bulletin board T110 tyres

No, I did not forget about TriCor. I was just thinking (without having to crack my books) that 1950 and earlier U.S. machines offered a WM3 as an option. However, it doesn't look like a WM3 was an option until the 1951 model year for the TR5.

@ Stuart, the links I posted for Mitas and Avon websites include measured dimensions as well marked sizes. In my experience, there are differences between the measured dimensions for tyres from different manufacturers for identically marked sizes. This is particularly noticeable for dirt bike tyres.

A view of historical tyre sizes https://www.draganfly.co.uk/index.php/ariel/4-stroke/cateory/category/712-tyres

Hi,
I appreciate that but, as I posted:-
... e.g. https://www.avontyres.com/en-gb/tyre-care/technical/tyre-size-information/. Otoh, there aren't any 'comparisons' - tables or charts - of different tyre overall diameters and widths, the reader must make up his or her own comparison by visiting each tyre maker's publications?

How are dirt bike tyres relevant? The thread is titled, "T110 tyres"; I can't see anywhere the OP's posted he intends to go dirt riding on it?

I've posted already there are "differences between the measured dimensions for tyres from different manufacturers for identically marked sizes" of road tyres; however, the data published by tyre makers shows, for identically marked sizes, overall diameters vary by only a few millimetres, it's overall widths that vary more.

Ye-ea-ah ...
... if you ignore the "cases" where it wasn't?



... it's some use to Ariel owners?

Regards,

Post dissection, how wonderful. You'll not be dragging me into that maelstrom of crap, wrong forum.

Hi Folks revisiting this thread as the dodgy bridgestones my dad previously put on (90/90 and 100/90 x19) worry me too much as they are rock hard. (WM2 front and WM3 back), and the rear says " for front use only"......

I checked out current tyres and SR is on to a good thing , literally the only tyres that come in 3.25 and 3.5 (x 19) are SR's good call on the Heidenau K34.

The K70's and the AM6/AM7 (Speedmaster / safety mileage ) are the other two options that come in these sizes, but all have too low speed ratings for Turner's boldly advertised 110 MPH...

Going metric it seems as there are almost no 100/90 that are approved for rear use , all seem to be front use only, this will also fail my "controle technique"

SR, how did your Hidenaus work, were you still happy with them?

The other alternative is to go with a larger tyre like the K81 but at 3.6 and 4.1 will they look larger and out of place on the T110? Or am I splitting hairs. Actual width specs are hard to find but it seems the K81s will be about 1 cm wider front and back than the 3.25 and 3.5's

Sort of like the idea of putting on the same sizes as it came with, but maybe that's ignorant?

Edit: Avons do seem to have the rear approval for the 100/90 so also another wider option. will need to measure my swing arm. However the Avons only have 5mm of tread !!!!
versus the others with 7 or 8 mm EEEP...



Cheers

Hi Brett,
Depends what you're comparing with? If with the bike's original 3.25x19 front and 3.50x19 rear:-

. First thing to remember is the closest overall dimensions to your bike's original tyres are likely to be the K70's.

. Then Dunlop certainly used to mould "REPLACES 3.50" on 4.10 TT100's sidewalls; however, the TT100 will be about half-an-inch wider overall (was one of the primary reasons for 'em). 100/90 Roadrider is then only a little wider overall.

. Replacing the 3.25 will be more vexing ... As a general rule-of-thumb, 3.25 is:-

.. about the same overall diameter as a 4.10 or 100/90 ... but they have a greater overall width ...;

.. about the same overall witdh as a 3.60 or 90/90 ... but they have a - noticeably - smaller overall diameter ...

It's a nice idea but it depends on the overall dimensions the maker of the tyres you choose works to - e.g. the 3.25 Roadrider (a modern-design tyre) is about half-an-inch wider overall than the 3.25 K70 (an old-design tyre) ...

Tch, the tarmac-rippling power of a Ton-Ten is going to wear that out in no time ...

Hth.

Regards,

Thanks for the input Stuart,

I just poked around a bit and measured the front mudguard supports that are the width limit - about 98 mm so that excludes almost all tyres including the Roadrider at 98mm , the hidenau will have 2 mm to spare and the EEEP - Speedmaster - has 14mm to spare .... (and only 4mm of tread...), its speed rating is "S" so at least it will pass control here......

Hmmm not as easy as I thought...

K70s will fit , same dims as the Speedmaster, but speed rating is only 93MPH / 150 KPH I might need to write a letter to the inspection folks and ask them....

Seems K70 and Speedmaster both have a bad rap but K70's are considered better?

Does anyone have a link to a fairly definitive road test of the time showing real top speed. The swiss are fairly pragmatic and should accept reasonable supporting info.

There is a T110 road test in the book "Classic Motorcycles of The Fifties" by Bob Currie that says highest one way speed 109mph. Average of runs in both directions on the track 101mph.

Dave

Jeez, found that I had 10 spokes (all the same one in the pattern) that where held on by only 3 or 4 threads. I know that the thread length = diameter is at maximum strength (or is it 1.5 x...), but still!! Guy who built my wheel some years ago is dead otherwise I'd have a few words.... It came back wtih the wheel on so I never checked.......

Any recommandations of where to get just a few specific spokes in UK/Europe?

Hi Brett,
Mmmm ... bear in mind Avon's recommended rim width is 2.15 (WM3 as was) but you're putting the tyre on a WM2 (1.85), so that should make the overall width a bit narrower?

Likely as above for the Heidenau also?

Do you have a tyre shop that'd get in both, fit 'em on the front wheel and let you see if the complete wheel'll fit in the forks? Just might cost a bit more for multiple fittings.

'Old design' tyre again?

I only have one experience of the Avon (and actually a SM) - youthful exuberance (on a Honda 250K4) overcame traction, I've borne the resulting scar for just shy of half-a-century ...

Central Wheel Components in Brum?

Hth.

Regards,

I once rode home from a rally on a '71 T120 with a 4.10x19 K81 on the front. I bought a fender at the swap meet. With no chase vehicle, I had to mount it to get home.
Precious little clearance between fender mounting bolts and tire, but I made it home. Bought a 3.25x19 tire the next week.

I just measured both and the K81 4.10x18 on my Bonneville measures 103.6mm at the widest point. The 100x19 Road Rider on my Trident measures 104.6mm. Of course they're both on WM3 rims.