Which tyre?

[Seanie]

Hi all,
At the moment I have a Metzeler lasertec on the front, (3.25-19m/c 54h)
And Kings tire on the rear, (120/90h18 71h)

The number on the front one does not make sence to me...
What size should they both be? And which size & brand are best suited for my bike?

I only have it a few weeks, ant the tyres seem to have a good bit of life left in them, but the front has a small bit of weather cracking on its sides.

So Im just thinking of sticking new ones on altogether to play its safe.
Any advice would be great!

Thanks in advance.

[Steve]

My advice? GET RID OF THAT FRONT TIRE.

Not because it's a Metzeler, but because of its apparent age.

They have not used that size designation for years, so check the age of the tire.
Lots of information in the forum on how to check the age of the tires, but here it is again:
(hopefully it also applies in Ireland)
Over here, we have a DOT number embossed on the side of the tire. There is a block at the end of the number that will have either three or four digits. They are the date code. The first two digits show the week of the year. The last digit or two will show the year. For example, if your date code is 387, the tire was made in the 38th week of a year ending in 7, but you don't know if it was 1977, 1987 or 1997. In 2000, they changed the date code to FOUR digits, so a similar tire would have a date code of 3807.

Tires are good for 3-5 years, so if you see a three-digit date code, you know it's at least 11 years old and needs to be replaced.
You say it has some weather checking, so it likely needs to be replaced anyway.

By the way, the 3.25-19m/c 54h size designation breaks down like this:
the 3.25 is the width (in inches), it's about equivalent to a 90mm.
the 19 is the diameter of the wheel, again, in inches
the m/c shows that it's intended for motorcycles
the 54h is a weight rating

The most likely tire you will want to put on will be a 90/90-19 or a 100/90-19. The brand is up to you.

.

[koolaid_kid]

The cracking you report is age, please don't ride on that. Having a flat on a bike is no joy, especially the front.
There are lots of good tires out there. I just put a pair of Avon RoadRiders on my GS, and they are great.

[sschering]

Based on you having a 82 GS750EZ

Avon makes new Road Riders in 3.25-19 front and 4.00-18 rear..

You could also use 90-90-19 front and 110-90-18 rear.

or

100-90-19 front 120-90-18 rear..

Remember on bikes wider isn't always better.. It's more important to have the tire fit the rim correctly.

Don't forget new tubes!

[koolaid_kid]

Based on you having a 82 GS750EZ
Avon makes new Road Riders in 3.25-19 front and 4.00-18 rear..
You could also use 90-90-19 front and 110-90-18 rear.
or
100-90-19 front 120-90-18 rear..
Remember on bikes wider isn't always better.. It's more important to have the tire fit the rim correctly.
Don't forget new tubes!

Good info. I went tubeless on my GS tube wheels, the jury is apparently still out on this move. I (well, bwringer) had to mill the front wheel where the fitting seats, but it was worth it IMHO. No leaks, no tubes, good air.

[Nessism]

Based on you having a 82 GS750EZ

Avon makes new Road Riders in 3.25-19 front and 4.00-18 rear..

You could also use 90-90-19 front and 110-90-18 rear.

or

100-90-19 front 120-90-18 rear..

Remember on bikes wider isn't always better.. It's more important to have the tire fit the rim correctly.

Don't forget new tubes!

I'd do this... 100-90-19 front 120-90-18 rear.

[Seanie]

Both tires are marked tubeless....Should they be tubed?

Which should I go for?

[tkent02]

Both tires are marked tubeless....Should they be tubed?

Which should I go for?

Road Riders are great tires, your 1982 wheels should be designed for tubeless, look for the words tubeless applicable cast in the wheel near the size designation.

[Seanie]

Great, Thanks!

[Seanie]

Ive taken onboard your advice, and ordered a set of Avons, as below. Should have them on late next week...

Cheers!