testy

Author Topic: cb750k front tire size...  (Read 2610 times)

0 Members and 1 Guest are viewing this topic.

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
cb750k front tire size...
« on: May 31, 2010, 09:39:58 AM »
Can a 500 width tire fit on a '71 cb750k...and have adequate clearance on the sides...?

My bike is broken down...and i don't have a 500 width tire to test it with anyway...  I don't wanna buy it and it not fit...

Thoughts, fellas??
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #1 on: June 01, 2010, 07:53:34 AM »
no one?
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline DukieDukenDuke

  • Bona fide
  • Really Old Timer ...
  • ******
  • Posts: 11,200
  • Wish? Did somebody say wish?
Re: cb750k front tire size...
« Reply #2 on: June 01, 2010, 07:55:48 AM »
What are the dimensions of the tire?
"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

"It's Baltimore, gentlemen. The gods will not save you." Ervin Burrell

CB750 K3 crat | (2) 1986 VFR750F

Offline Operator

  • Someday I will live up to being a
  • Expert
  • ****
  • Posts: 839
Re: cb750k front tire size...
« Reply #3 on: June 01, 2010, 07:58:16 AM »
The FAQ has a sizing chart
If ever there was a creator of bastard sons, it is the open road, for she has claimed so many young men yearning for freedom......

1973 CB750 K3
1976 CB400F (Cafe Project)
1979 Yamaha XS400 (Currently up for Sale)

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #4 on: June 01, 2010, 11:28:22 AM »
Tire size:  500 = 5" widest point,  OD = 26.25"

I am NOT looking to use the stock tire size or the 'recommended' tire size.  I am moding the look of the bike and want to use a 500 on the front.  I am just trying to see of it fits before I buy it.  Thought someone might just know...

Like I mentioned...the bike is completely disassembled so I can't measure between the widest part of the fork lowers, right now.

Thanks for looking...

1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline crazypj

  • I'm brill, me
  • Old Timer
  • ******
  • Posts: 4,305
  • first 100,000 miles. 1977 CB550F
Re: cb750k front tire size...
« Reply #5 on: June 01, 2010, 12:32:04 PM »
What rim are you fitting?
on a stock rim-you must be crazy, needs WM4 or bigger (minimum 2.50" inside beads, about 3.25" on outside)
I fake being smart pretty good
'you can take my word for it or argue until you find out I'm right'

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #6 on: June 01, 2010, 04:19:16 PM »
custom...stock hubs laced into buchanan hoops...16 X 3.25....front and back matching rims and tires.

Well....that's the idea anyway...
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline crazypj

  • I'm brill, me
  • Old Timer
  • ******
  • Posts: 4,305
  • first 100,000 miles. 1977 CB550F
Re: cb750k front tire size...
« Reply #7 on: June 01, 2010, 05:22:59 PM »
Going to be expensive then, Buchanan's aint cheap  ;)
I fake being smart pretty good
'you can take my word for it or argue until you find out I'm right'

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #8 on: June 02, 2010, 08:24:19 AM »
ha...yeah...i know...i've done the research.  if you have a cheaper solution, I'm all ears.  But the front hub has to be custom punched...there are no 16" front hoops.  Unless there is an 18" hoop out there that was made for a front hub...I'd go that route too.

But hoops, spokes, lacing, truing, and coker tires....looks like I'll have almost a G into the wheels alone.  Effing...OUCH!

the questions still stands...will a 500 fit?
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline Gordon

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 11,570
  • 750K1, 550K2
Re: cb750k front tire size...
« Reply #9 on: June 02, 2010, 09:12:39 AM »
I never tried a 5.00, but I can tell you that on my K1 with an Avon Roadrider 3.25-19 there is exactly 3/8" clearance at the tightest spot on both sides.

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #10 on: June 02, 2010, 10:06:12 AM »
3.25 + 2(.375) = 4.00" MAX clearance...  >:(
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline crazypj

  • I'm brill, me
  • Old Timer
  • ******
  • Posts: 4,305
  • first 100,000 miles. 1977 CB550F
Re: cb750k front tire size...
« Reply #11 on: June 03, 2010, 03:24:06 PM »
ha...yeah...i know...i've done the research.  if you have a cheaper solution, I'm all ears.  But the front hub has to be custom punched...there are no 16" front hoops.  Unless there is an 18" hoop out there that was made for a front hub...I'd go that route too.

But hoops, spokes, lacing, truing, and coker tires....looks like I'll have almost a G into the wheels alone.  Effing...OUCH!

the questions still stands...will a 500 fit?

 Don't think I understood your first post.
Rims don't care, you lace it to whatever hub you want.
CB750 has 40 hole hub (same as CB500/550)
You just need a 40 hole rim, whatever diameter you choose (within certain limits, tyres may not be available in some sizes)
 I have a couple of Harley rims which fit 5.00 x 16 tyre, don't know why you think it has to be custom?
 Spoke kits are available on e-bay to fit HD rims to Honda hubs, even if you paid Buchanan prices for spokes you should have less than $500.00 into wheels (spokes are about $100 a set)
 Just did a quick search of 16" HD rims, cheapest, $24.50   Pair, $154
http://cgi.ebay.com/ebaymotors/Triumph-16-Rim-BSA-Chopper-40-Hole-Harley-_W0QQcmdZViewItemQQhashZitem4a9d5619d8QQitemZ320467245528QQptZMotorcyclesQ5fPartsQ5fAccessories
« Last Edit: June 03, 2010, 03:39:29 PM by crazypj »
I fake being smart pretty good
'you can take my word for it or argue until you find out I'm right'

Offline Burnboy

  • Hot Shot
  • ***
  • Posts: 458
Re: cb750k front tire size...
« Reply #12 on: June 03, 2010, 04:59:42 PM »
The 750 cant handle a very big tire on the front. I swapped a gl1000 front end onto mine and fit a 130 front. I laced a 16'' by I think 3 inch front tire probably the biggest that will fit, theirs very little clearance to the fork tube lowers.
1975 CB750
1973 CB350F

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #13 on: June 03, 2010, 08:36:06 PM »
The 750 cant handle a very big tire on the front. I swapped a gl1000 front end onto mine and fit a 130 front. I laced a 16'' by I think 3 inch front tire probably the biggest that will fit, theirs very little clearance to the fork tube lowers.

I have a 3.5" on my cb500 and its got about 1/4" clearance on each side.
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

Offline brycegp

  • Hot Shot
  • ***
  • Posts: 527
    • 1971 CB750 "Mut-N-Chop" Cafe Project
Re: cb750k front tire size...
« Reply #14 on: June 28, 2010, 12:57:10 PM »
ha...yeah...i know...i've done the research.  if you have a cheaper solution, I'm all ears.  But the front hub has to be custom punched...there are no 16" front hoops.  Unless there is an 18" hoop out there that was made for a front hub...I'd go that route too.

But hoops, spokes, lacing, truing, and coker tires....looks like I'll have almost a G into the wheels alone.  Effing...OUCH!

the questions still stands...will a 500 fit?

 Don't think I understood your first post.
Rims don't care, you lace it to whatever hub you want.
CB750 has 40 hole hub (same as CB500/550)
You just need a 40 hole rim, whatever diameter you choose (within certain limits, tyres may not be available in some sizes)
 I have a couple of Harley rims which fit 5.00 x 16 tyre, don't know why you think it has to be custom?
 Spoke kits are available on e-bay to fit HD rims to Honda hubs, even if you paid Buchanan prices for spokes you should have less than $500.00 into wheels (spokes are about $100 a set)
 Just did a quick search of 16" HD rims, cheapest, $24.50   Pair, $154
http://cgi.ebay.com/ebaymotors/Triumph-16-Rim-BSA-Chopper-40-Hole-Harley-_W0QQcmdZViewItemQQhashZitem4a9d5619d8QQitemZ320467245528QQptZMotorcyclesQ5fPartsQ5fAccessories


I'm totally down to use the harley rims.  But my question is this...when I have them laced up... Don't the holes in each rim (front and rear) have to be punched at the correct angle or the spokes will bend??

Is that correct?  how do i get the correct rims for front and back hubs to be laced up without bending the spokes?

Buchanan reps told me this issue...maybe just to sell me their rims versus getting them on ebay.  but it makes sense that the angle in which the holes are punched in the rim must match the hub that your lacing it to.

thoughts??
1971 CB750K/F - El Toro
El Toro Build Thread - http://forums.sohc4.net/index.php?topic=73552.0

 

;
Honda