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Tire Size for '77 750

  • Thread starter Thread starter TheNose
  • Start date Start date
brit7.11 said:
robinjo said:
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?
Click to expand...

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!! :D ) 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.
Click to expand...

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 :cry: tire on it (some east german crap) and a new Metzeler at the back.
 
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? :?:
 
Tire size on a 1977 GS 750

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.
 
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