I've just re-examined my parts book and although the WM2-18 appears to be standard for the UK bike, it DOES list at the foot of the page a WM3-18 as an alternative rim for a 4 inch tyre. I hadn't noticed this before. Thanks for causing me to take a closer look! :-)
Re: T120 - a wider tyre, pros and cons?#104842 11/05/0610:04 pm11/05/0610:04 pm
I think that the "home" models came stock with a 3.50X18 on the rear on a WM2-18, whereas the export models, at least those to the US, had a 4.00x18 on a WM3-18 rear as standard. Some models even had different side stands because of the tire size, I believe.
Re: T120 - a wider tyre, pros and cons?#104843 11/05/0611:07 pm11/05/0611:07 pm
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by shel: <strong> i wish they would have gave us the big tank as well
Johann, you could easily end up with tyre/chainguard clearance problems if you go too wide with a rear tyre and std chainguard. A 110 Avon is very close on my '69 Tiger.
1969 TR6R 7.62 x 51 is not a maths puzzle.
Re: T120 - a wider tyre, pros and cons?#104845 11/06/0611:57 am11/06/0611:57 am
I can verify that models exported to the US have a 18" WM3 rim on the rear so should be OK on your bike. Actually, I have a WM4 rim on my Triumph that I use for Proddie racing and it works fine.
As Tiger has pointed-out its more the tire width that you need to be concerned about. In this regard there is no clearance problem with the original 4" K70's that were fitted stock. However you have to be carefull when selecting a more modern tire. In the case of Avon Road Runners/Super Venoms that are very popular the widest you can get away with without the tire rubbing the chainguard is 90/110 (4.33") as Tiger has already stated. However, if you are prepared to run without the chainguard or alternatively cut a slot in it a 90/120 (4.72") will fit OK. That is what I have done with my T120 and BSA Rocket Three.
Re: T120 - a wider tyre, pros and cons?#104847 11/06/065:35 pm11/06/065:35 pm
I had exactly the same decision to make when rebuilding my 69 TR6 over the last few years. It was only when I spoke to the very reputable Tony Miller at the then Miller Motorcyles,Hastings ,that I made my mind up and went for the stock WM3-18. I was able to source a new old Avon Roadrunner R2 100/90 that was a bit difficult to fit to the rim but didn't give me any clearance problems with the chainguard. On the original WM2-19 front I have fitted an Avon Roadrunner AM20 which has performed fine this summer. BTW Tony also advised against drilling the rim and fitting the security bolt as all I was using the bike for was pleasure riding as against speed trials or other high performance riding. HTH.
Mick 1969 TR6
Re: T120 - a wider tyre, pros and cons?#104848 11/07/066:40 am11/07/066:40 am
Originally posted by Johann T: the WM2-18 appears to be standard for the UK bike,
I believe it's actually a typo - if you look in other Triumph publications for the model, and in other years, you'll find WM3-18 for the rear rim on a UK & GE bike; also, if you look at the other bikes in the range, they were all specified for WM2-19 front and WM3-18 rear.