Author Topic: Tire Sizing - 81 CB750K... Is this ok? Your help is appreciated  (Read 889 times)

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Offline CB750Noobie

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I'm new to these bike, which should be apparent by my name  ;)... The OEM rim size for my 81 CB750K DOHC front is 19 x 1.85, rear is 2.50 x 17.

Currently the rear came with a 130/90/17 and that fits is fine, and the front is a 100/90/19 which is also appears to fit great. I do a decent amount of riding on gravel and dirt trails, so I do like the Shinko 704/705 style tires (or any recommendations of a similar tire). I'm not going to put a set of TKC80s or some other big block 50/50 or 60/40 off road style tires on it, however.

The Shinko 704 705s come in the same size for my rear (130/90/17) which currently has no clearance issues, but for the front the only size in that tire thats close is a 110/80-19. Which has me concerned that its too small a profile for the sidewall, and too wide a tire for that 1.85 rim.

I'm open to all input; I've seen threads with sizing charts for the pitch for rears, but have not found one for fronts. All feedback is appreciated. Trying not to do something dumb here.

Offline CB750Noobie

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Re: Tire Sizing - 81 CB750K... Is this ok? Your help is appreciated
« Reply #1 on: April 22, 2020, 02:32:31 PM »
I suppose I can simplify my questions:
-Does anyone know what the OEM sizes for a 1981 CB750K DOHC front and rear tires are?
-what are the safest sizes to run on a 1.85 x 19 front?
-what are the safest sizes to run on a 2.50 x 17 rear?
« Last Edit: April 22, 2020, 02:49:00 PM by CB750Noobie »

Offline ekpent

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Re: Tire Sizing - 81 CB750K... Is this ok? Your help is appreciated
« Reply #2 on: April 23, 2020, 07:22:10 AM »
Here are specs and tire sizes for 1981 750K  https://www.motorcyclespecs.co.za/model/Honda/honda_cb750ka%2080.htm