Topic: k81 front on a cb750k2?

[socalsupermoto]

i've done a lot of tire searching! decided on the k81's. front on my cb750k2 is a 100/90/19 or 3.25 - 19. the k81 comes in a 4.10 - 19. anyone running this? Is it too big or does it work just fine?

according to the dunlop site, both 4.1/19 and 3.25/19 tires should run on 2.15 rims

3.25-19 TT 54P BW 4202-23 2.15 26.58 3.30 7/32 465 @ 32

4.10H19 4PR BW 4206-54 2.15 26.46 4.00 9/32 551 @ 41

[MCRider]

i've done a lot of tire searching! decided on the k81's. front on my cb750k2 is a 100/90/19 or 3.25 - 19. the k81 comes in a 4.10 - 19. anyone running this? Is it too big or does it work just fine?

according to the dunlop site, both 4.1/19 and 3.25/19 tires should run on 2.15 rims

3.25-19 TT 54P BW 4202-23 2.15 26.58 3.30 7/32 465 @ 32

4.10H19 4PR BW 4206-54 2.15 26.46 4.00 9/32 551 @ 41

I've run the 4.1/90-19 on my K2. You have to take one brake off if you have two, to mount and unmount the wheel. (Let the air out too.)  Otherwise it fits. Its one heck of a lot of heavy rubber. A 3.6 (is that available?) would be a better size, or even the 3.25 K81 is more than sufficient and keep the weight down. The 2.15 will open it up a tad over the 1.85.

Do you have a 2.15 front rim? stock is 1.85.  I've changed to a 2.15 x 18 and will run a 4.1/80 x 18 on current project.

[socalsupermoto]

oops i guess i have a 1.85. the k81 doesn't come in a 3.15 but the k70 does and it also looks the biz, so i guess i should go with k70 front, k81 rear?

[MCRider]

oops i guess i have a 1.85. the k81 doesn't come in a 3.15 but the k70 does and it also looks the biz, so i guess i should go with k70 front, k81 rear?

I was suggesting a 3.6 tire not 3.15 (typo?) maybe I was thinking of the K70. Nevertheless, I personally wouldn't mix a K70 with a K81. They were designed for 2 different purposes. The K70 has a squared off profile for semi off road use. It was put on all the British scrambler style motorcycles. The K81 has a triangle profile for leaning into curves, an early attempt at a sportbike tire.

I'd rather have the K81s front and rear. Many use the K70s as they are period tires and popular.

I think mixing the two would feel funny. Especially a square profile in front.  Onlookers in the know would cringe.

But if you like it go for it. Its your baby.

[IHWillys]

...I personally wouldn't mix a K70 with a K81...
I think mixing the two would feel funny...

Agreed.  I've read several times from different sources that the K81(TT100) should be used front and rear due to the profile.  I have no personal experience, though.

Ken

[socalsupermoto]

sweet. thanks for the info. I have plenty of "performance" bikes, so I think i'll try k70's front and rear to go for the look. if i change my mind and want performance i'll pick up some avon supervenoms. I've used those in the past and they are very very sticky for non 17's:
http://www.totalmotorcycle.com/photos/tire-tyre-guide/Avon-SupervenomAM20-AM18.htm