Author Topic: Cb500 K2 - TIRE SIZE  (Read 157 times)

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Offline malxerr

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Cb500 K2 - TIRE SIZE
« on: March 06, 2026, 12:27:01 AM »

Hi Bikers,
Currently my CB500 four K2 Front tire size, is 100/90 19 while rear tire is 120/90 18.
Are they the correct size according to specification?
Regards

Offline Kenzo1979

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Re: Cb500 K2 - TIRE SIZE
« Reply #1 on: March 06, 2026, 03:15:04 AM »
Yes, that’s correct. 
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Re: Cb500 K2 - TIRE SIZE
« Reply #2 on: March 06, 2026, 09:35:35 AM »
You will find that with the 120/90 height rear tire, the bike will lean a LOT more over the sidestand, making it pretty unstable. If you go with an 80-profile tire in the 110/80x18 and a corresponding 100/80x1819 front, it will sit on the sidestand far better, not wanting to fall over when something is strapped onto the seat (like a knapsack).

(Fixed typo on front tire diameter.  :-[ )
« Last Edit: March 07, 2026, 10:15:12 AM by HondaMan »
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Offline Little_Phil

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Re: Cb500 K2 - TIRE SIZE
« Reply #3 on: March 06, 2026, 09:44:39 AM »
110/90 (4.33"] is sufficient and best for rear. Bike was originally fitted with 3.00" front and 3.25" rear with 100% profile.

Offline Deltarider

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Re: Cb500 K2 - TIRE SIZE
« Reply #4 on: March 07, 2026, 01:56:26 AM »
[...] Bike was originally fitted with 3.00" front and 3.25" rear with 100% profile.
Sorry to correct you: front tyre originally was: 3.25-19. The rear was 3.50-18 and later models had 3.75-18. The 3.75 is hard to find, but all CB500/550 rear rims will also accept: 400-18.
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Offline Little_Phil

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Re: Cb500 K2 - TIRE SIZE
« Reply #5 on: March 07, 2026, 09:56:08 AM »
You're right...it's an age thing. And 4.25/85 was commonly fitted on the rear if I can get that right.