Author Topic: Lacing a front hub from a GL1000 to the rear wheel of a CB750F  (Read 1223 times)

0 Members and 1 Guest are viewing this topic.

Offline Kev

  • Ladies love a
  • Full Member
  • *
  • Posts: 4
  • Attorney at LAWL
Hey Guys,

I've got a GL1000 19" wheel and hub, but I wanted to go with a smaller front wheel (wanted to run 18s on both ends; don't really like the look of the GL1000 rim either). I also bought a lot of CB750F parts which included a 2.5x18" rear wheel. I was wondering if it was possible to lace the GL1000 front hub to the rear rim of a 750F.

A cursory search of tech articles says I probably can't ... The GL1000 front is a 19" wheel, and the CB750F is an 18" ... Or am I jumping the gun a bit?

Thanks!
'81 CB650 - "Marisa" (VTEC? Oldtec.)
> Keihin CVKs + UNI pod filters
> Kerker 4-into-1
> '75 GL1000 Front end swap
> CB750SS Front calipers + Braided steel lines
> Nissin 5/8" Master Cylinder

'05 SV650N - "Cirno" (hoon-muter)
> SVRacingparts Rearsets
> Woodcraft Clipons
> CRG Levers
> Yoshimura Trioval slip-on
> Hella Supertones
> Airbox hack

Offline Gonzowerke

  • I burn asses like a Bhut Jolokia, 'cause I'm a real
  • Hot Shot
  • ***
  • Posts: 360
  • Member #106, Owner of the ORIGINAL Frankenbike!
Re: Lacing a front hub from a GL1000 to the rear wheel of a CB750F
« Reply #1 on: April 26, 2010, 06:01:20 PM »
Naah...talk to the fine folks at Buchanan's,

http://www.buchananspokes.net/

And they will set you up with the proper length, once you tell them what you are doing. What size tire are you going to run up front? If everything clears, you shouldn't have any probs. The only issue then is weight of the tire/rim and how it will affect turn-in.
1977 F2 "Highway Star"
1977 F2 "Bike-In-A-Box"
1978 K8 "Frankenbike"
1991 CRX Si "Buzz Bomb"
2000 Jeep Wrangler "UBoat"
2011 BMW S1000RR "TIE Fighter"

Offline MCRider

  • Such is the life of a
  • Really Old Timer ...
  • *******
  • Posts: 14,376
  • Today's Lesson: One good turn deserves another.
Re: Lacing a front hub from a GL1000 to the rear wheel of a CB750F
« Reply #2 on: April 26, 2010, 06:08:13 PM »
Hey Guys,

I've got a GL1000 19" wheel and hub, but I wanted to go with a smaller front wheel (wanted to run 18s on both ends; don't really like the look of the GL1000 rim either). I also bought a lot of CB750F parts which included a 2.5x18" rear wheel. I was wondering if it was possible to lace the GL1000 front hub to the rear rim of a 750F.

A cursory search of tech articles says I probably can't ... The GL1000 front is a 19" wheel, and the CB750F is an 18" ... Or am I jumping the gun a bit?

Thanks!
True Buchanans can get you the spokes, they seem to have extensive databases and calculators.

One issue to address is the angle of the hole drilled thru the dimpl on the CB750F rim. I think the spool hub on the F was slightly larger diameter than the GL1000 front spool. That would mean that the spokes for the smaller spool would be longer, and at a less steep angle going into the rim. Better less steep than more steep.

Once you get it laced up and start truing you would see the spokes develop a bend near the nipple end as it enters the rim, if the angle of the hole was off.

If you are using a heavier gauge spoke and nipple, like we usually get from Buchanans, you would need to enlarge the holes in the rim and you could tweak the angle at that time. I've seen laced wheels with very obvious bending to the spokes. I have drilled an alloy rim to fit a CB750 Drum by eye and did a pretty good job at it. But a few spokes had minimal bending. I ran that wheel for a long time, the spokes are so much stronger than stock a  very slight bend doesn't hurt. But I would never drill my own again.

Buchanans must have a calculatoir and drill jig to do theirs.
« Last Edit: April 26, 2010, 06:11:55 PM by MCRider »
Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline Kev

  • Ladies love a
  • Full Member
  • *
  • Posts: 4
  • Attorney at LAWL
Re: Lacing a front hub from a GL1000 to the rear wheel of a CB750F
« Reply #3 on: April 26, 2010, 06:18:03 PM »
Ah, I figured I'd have to contact Buchanan's for custom spokes ... There goes my spending money for the first half of summer.  :'(  I was thinking about running a 110/90/18 or similar Bridgestone BT45 or Spitfire 11F up front. The Goldwing rim has a 110/90/19 on it, so I don't believe I'll run into any clearance issues.

I was planning on lacing the disc brake hub from the 750F to a custom 18x3.5" or 4.25" Sun rim from Buchanan's as well.

I forgot to mention the bike was an '81 CB650C.  :-X
'81 CB650 - "Marisa" (VTEC? Oldtec.)
> Keihin CVKs + UNI pod filters
> Kerker 4-into-1
> '75 GL1000 Front end swap
> CB750SS Front calipers + Braided steel lines
> Nissin 5/8" Master Cylinder

'05 SV650N - "Cirno" (hoon-muter)
> SVRacingparts Rearsets
> Woodcraft Clipons
> CRG Levers
> Yoshimura Trioval slip-on
> Hella Supertones
> Airbox hack