Tire Size for '77 750

[Anonymous]

OK, Now I'M confused. I was told a 100/90 - 19H tire would be correct to replace my 3.25 x19H tire. Is this still true, or is it true if I only get a particular brand of tire?

Roger Moore

100/90 is always correct to replace a 3.25, whatever the brand.

I commute year round, come rain, sleet whatever. Bring it on!!

[Anonymous]

Well...imagine the SAME streets with 20 years of growth! We're like #2 or #3 worst in the country compared all the time with LA and NYC, and I know NY'ers that say we are bad, so there you have it.

I'm not a fan of using motorcycles for commuting -- I'd rather be listening to the radio if I'm going to be sitting in traffic than sitting above a hot engine that really would rather be moving to keep it cool. I try to find as many free roadways as possible, but even then there's already a lot of other people trying this. Now, getting on Hiway 101 on the coast -- that's motorcycling! 8)

[Anonymous]

I commute 25 miles each way. It takes me 23 minutes on average, and I am doing 85-90 mph for most of the journey.
Guess I'm lucky.

[Anonymous]

And Oh m'gawd --- and he's driving on the wrong side of the road!!!!

Now, are those imperial miles per hour or metric miles per hour :roll:

[Anonymous]

But wait, you guys do drive on the right side of the road don't you? It's just that your steering wheels are bass acwards. Or maybe we're all wrong over here, but that coudn't be... could it?



Stuck here in commuter hell :twisted:

[robinjo]

If the correct size front itre is 100(mm) then why is my 3.25"front tire 89mm wide??? wouldn't a 100m tire become to sqeezed together at the rim and make it turn unstable?

Not all 3.25 tyres are 89mm wide, this would vary from maker to maker. Metric 100mm wide tyres area different profile and are designed to be wider, its not just like fitting a wider tyre (or tire!! ) The imperial sizes were an older profile. I.E. same size rim, imperial size tyre is narrower and taller than metric.
You are right though to say that fitting an excessively wide tire to a rim distorts the profile and could lead to handling issues. A metric 100/90 tyre is designed for the 2.15" rim.

Thank you very much for that clear answer, I'm glad I can go to 100/90/19 at the front.
Wanted more rubber up front, right now the bike has a horrible HEIDENAUER 8O tire on it (some east german crap) and a new Metzeler at the back.

[mcycle-nut]

Bike, '78 GS750. Front tire, Metzeler Me33 Laser, 3.25H19. Rear tire, Yokohama Tour Star, 120/90/18. I bought these tires years ago, but they are still quite serviceable, ie no cracks, tread still good, etc. I don't know if Metzeler even makes this size anymore, and I know Yokohama doesn'
t even make motorcycle tires anymore. Didn't they sell out to Bridgestone?

[Anonymous]

Tire size on a 1977 GS 750

Hello,

I use Michelin Macadam 4.00-18 rear and 3.25-19 front on my 1977 GS 750. Super good adherence and the price is not too bad also. As far as the look goes, the rear tire could be 4.25 or even wider, but I only found this size for my bike.

I also have Michelin Macadam on my BMW R1150RT the adherence is super, but I find that because of the greater bike weight they tend to use faster.

Have a great ride.

[TheNose]

I found another post that recommends going to this site for information.

http://www.conti-tyres.co.uk/contibike/tinfo.htm

There is a lot of helpful information there. I have to give credit to saaz from Canberra for this link.


Terry