SOHC.co.uk Forums > CB500/550

Tyre size

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Murf:
Hi my 1975 550 K1 has standard rims and came with a 110 x 19 front and a 120 x 18 rear  tyre, from what I read these tyres are too wide for the rims, they are really old anyway and I need to replace them as part of my rebuild.
I can get a pair of Bridgestone BT 46  100/90 x 19 front and a 110/90 x 18 rear, at what passes as a reasonable price for tyres these days and I really like Bridgestone tyres. Even got them on my car👍

However I want to check if these sizes are ok as I am struggling to find any imperial sized tyres to suit.  Also what tyres have people found tend to suit the 550 as I am open suggestions about tyre make.
Thanks

Oddjob:
You could consider this. If the rims currently fitted aren’t in the best of condition then fit the rims off the 750, unlike the 500/550 which got 1.85 rims the 750 got 2.15 which will allow you fit wider tyres without sidewall flexing that would occur if using the standard rims.

I fitted Lester alloy wheels for the same reason, 2.15 rims. I ran 4.10 front and 4.25/85 Pirelli Phantoms and they were awesome, which equates to your 110 and 120 sizes.

Johnwebley:
I previously used Avon

3.25x19 f
4.00x18 r

Now have Bridgestone,

Feel great, run them at 28 f and 33 r,

If you use 90/90x19 f and 100/90x18r,I find it lowers the bike, makes for good handling but scrapes to easily



Sent from my SM-A546E using Tapatalk

Oddjob:
Could it be the better handling which allows you to get the bike over that causes the scraping though John?

Personally I found the 500 easy to get everything scraping regardless of what size tyres were on, I fitted the footrests off the 550F just to get the hero blobs underneath, that way I could feel the footrest lifting my foot up as it started to slide and I knew where the limit was much easier. My mainstand and footrest blobs were all chamfered in the end.

Johnny4428:
Toe of my boot seems to be my guide when out on the Pan.🤭

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