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Author Topic: Help - ideal tire combination for a 1978 CB750 K7  (Read 12695 times)

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Offline brewsky

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #25 on: February 27, 2018, 04:36:33 AM »
Dunlop D404's ...100/90 front and 130/90 rear on my K8
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Offline Erny

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #26 on: February 27, 2018, 05:51:51 AM »
How do you feel handling, especially in tight turns?
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CB550K1 USA model (1975)

Offline Yamahawk

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #27 on: February 27, 2018, 12:04:34 PM »
Those Dunlop 404's will last forever, as they are a very hard tire. In my experience, they are not the best in tight corners. My rear will skid at a moment's notice with moderate braking, but then again, they are pretty old tires, too. Even new, they aren't the best for cornering. I am replacing them this spring.
Charlie
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1971 CB750K1 (newest bike), 1996 Royal Enfield 500 Bullet (therapy bike), 1981 Yamaha XV920RH, 2006 Kawasaki Concours (retirement bike), 1975 Yamaha RD350 (race bike), 1989 Honda VTR250 Interceptor (race bike), 1986 Kawasaki EX250 Ninja (race bike in progress), 1985 Honda Elite CH250, 1973 Yamaha GT1 80cc, 1974 Yamaha DT360 project bike.

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Offline brewsky

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #28 on: February 27, 2018, 08:24:07 PM »
Quote from: Erny on February 27, 2018, 05:51:51 AM
How do you feel handling, especially in tight turns?

No problem with handling as far as I'm concerned. I'm on my 3rd set now I believe.
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66 CA77
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78 CB750K
02 FZ1
09 GL 1800

Offline Erny

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #29 on: April 02, 2018, 03:51:28 PM »
Just replaced rear tire - new BT45, old was IRC. Both were 120/90 R17.
Suprisingly, when measuring, new BT45 is only 115mm wide and IRC is 125mm!
Start to regret I did not take some 130/90, BT45 looks really tiny
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CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline Stev-o

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #30 on: April 02, 2018, 04:08:24 PM »
When I had a K8, I put a 130/90 on it.  Send it back!
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Offline Ellz10

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #31 on: February 23, 2022, 09:18:00 AM »
Refreshing this thread.

With the extra 10mm on the K7 & K8, I'm curious what size you're able to go to without severely hindering handling performance. 140 perhaps? I would have to accommodate for that in the front size tire though, would I not?
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Offline Bankerdanny

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #32 on: February 23, 2022, 02:18:24 PM »
Quote from: Ellz10 on February 23, 2022, 09:18:00 AM
Refreshing this thread.

With the extra 10mm on the K7 & K8, I'm curious what size you're able to go to without severely hindering handling performance. 140 perhaps? I would have to accommodate for that in the front size tire though, would I not?

The issue is not so much at what point does width negatively affect handling. It is (1) is there sufficient clearance for the chain and swingarm and (2) rim width.

The Bridgestone BT46 in 130/90-17 has a minimum width of 2.5", the width of a stock K8 wheel. They don't offer a 140 or 150 section tire.
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Offline eldar

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Re: Help - ideal tire combination for a 1978 CB750 K7
« Reply #33 on: February 26, 2022, 05:18:24 PM »
130 90 is fine for the rear. Handles perfectly well. 110 90 up front. I've used that size with different brands and it's been fine. However, I was not a fan of pirellis. Had them on my fz6 and below 50f, I might as well have been riding on ice. So, pirelli is a no, in my book.
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