snake89
CB750 Member
Anybody put a 18 inch rear drum brake wheel on a DOHC K model ? Guessing i could use a SOHC wheel but i know it uses a bigger chain. Any thoughts ? 
amc49
CB750 Guru
18 inch drum spoke rear wheel is standard on a US spec 750K DOHC. Early used 630 chain and switched to 530 later.
snake89
CB750 Member
Hmmm every K model ive seen including mine has a 17 wheel ?
amc49
CB750 Guru
DOHC Service manual clearly calls out for a 4.25X18 rear tire in specifications.............I suppose something could be wrong there.
EDIT...............You may well be right, the manual could be wrong there. Went back and checked, it DOES say 18" but going to ebay has several 17'' rims show up and no 18 anywhere I looked.
So manual probably wrong. I know the earlier ones had 18" though, it was the norm on the back for many years. Euro Ks got the Comstar mags, I wonder what size they were now?
EDIT...............You may well be right, the manual could be wrong there. Went back and checked, it DOES say 18" but going to ebay has several 17'' rims show up and no 18 anywhere I looked.
So manual probably wrong. I know the earlier ones had 18" though, it was the norm on the back for many years. Euro Ks got the Comstar mags, I wonder what size they were now?
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amc49
CB750 Guru
After some thought I'd bet the manual specs are for Euro K.
If you have a spoke front and looking to match simply respoke your drum back hub to a 18" rim..........early F spoked wheel would do that but the later mag ones won't.
If you have a spoke front and looking to match simply respoke your drum back hub to a 18" rim..........early F spoked wheel would do that but the later mag ones won't.
grepper
Old Bike Nerd
My 81 DOHC K has an 18 in rear wheel, spoked with drum.
Why cant you do that on the comstars? Pretty sure you can disassemble them.
JerrodR
CB750 Enthusiast
I have a 78 K Model I believe. It came with Lester Mags, 19" front and 18" rear. I didn't really care for the 18" so I found a 16" on eBay and that's what's currently on it. It was a Punted Cafe Racer Project when I bought it, and now that I have several other Bikes I wanna take it back to Factory Spec. And My question is did the 78's come from the Factory with the 18" Laster, or was it put on after? It's definitely not a Numbers matching Bike or anything, I just want it to look right...
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