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Offline orkid1989

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71 cb750 wheels and tires
« on: September 15, 2010, 05:18:13 PM »
alright i just bought a 71 cb750 and it needs new wheels and tires. i was wondering what would be the largest tire and wheel i could fit on the stock swing arm and where is a good place to find them?
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Offline MCRider

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Re: 71 cb750 wheels and tires
« Reply #1 on: September 15, 2010, 05:41:14 PM »
Quote from: orkid1989 on September 15, 2010, 05:18:13 PM
alright i just bought a 71 cb750 and it needs new wheels and tires. i was wondering what would be the largest tire and wheel i could fit on the stock swing arm and where is a good place to find them?
The "wheel" is the hub, spokes and rim assembled. What do you really need (and why, just curious). There are many discussions of this, I won't beat you up too bad for not searching first, as i like to talk.  ;)

The widest rim comfortably laced to a hub is a 3.5. The widest tire is a 150 in metric, or a 5.00 in inches. More than that requires repositioning the brake stay, and will only gain an additional fraction.

If you have a hub, you'll need spokes and a rim. Most common source is Buchanans Spokes.com.  Not cheap.

Stock width rim is 2.15 and stock tire is a 110, or 4.00.
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Offline orkid1989

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Re: 71 cb750 wheels and tires
« Reply #2 on: September 15, 2010, 08:02:29 PM »
o ok. that helps a ton. the main reason why i was needing the wheels is because the ones on it are old and look like crap. also the tires are dry rotted so need them too. i just wasnt sure what will fit and what wont
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Offline MCRider

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Re: 71 cb750 wheels and tires
« Reply #3 on: September 16, 2010, 05:30:53 AM »
Quote from: orkid1989 on September 15, 2010, 08:02:29 PM
o ok. that helps a ton. the main reason why i was needing the wheels is because the ones on it are old and look like crap. also the tires are dry rotted so need them too. i just wasnt sure what will fit and what wont
Then you'll be polishing your hubs, and replacing the spokes and rims. If its basically a stock bike I would just go with modest increases in size or it will look and feel out of place.

Fronts rims are 1.85, go to 2.15. Rear is 2.15, go to 2.5 or 3.0.
Tires are Front 90 metrics, 3.25 inches, go to 100 metric, 3.6 inches.
Rear tire go to 120 metric, 4.5 inches.

IMO
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Offline orkid1989

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Re: 71 cb750 wheels and tires
« Reply #4 on: September 16, 2010, 05:54:19 AM »
o ok and should i stick with 19" front and 18" rear?
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Offline MCRider

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Re: 71 cb750 wheels and tires
« Reply #5 on: September 16, 2010, 06:10:34 AM »
Quote from: orkid1989 on September 16, 2010, 05:54:19 AM
o ok and should i stick with 19" front and 18" rear?
If your bike is basically a stocker, that you intend to ride soon, I'd stick with the 19 and 18.

I'm experimenting with a 18 fr and 17 rr, but you have to be willing to compromise. I have other bikes to ride. The 18 front wil look weird with the stock fender which is curved for the 19. And you might have clearance problems elsewhere. On mine the brake brackets are very close, but i had mine chopped way down and am running a different fender that doesn't mount on the brake brackets.

Later CB750s came with a 17" rear, so that's doable, likely no clearance problems. It will lower the rear of the bike a tad and kick out the front end, a tad, for more "trail". Again you have the looks problem of a fender curved for an 18" wheel. Mine looks a little weird under the 18" fender. There's more open air between the wheel/tire and the fender. Also, it will be harder to lift up on the centerstand. And it will stand straighter on the sidestand. I am running a slightly longer front end to restore the ride height, but I'll still have to muscle it up on the centerstand.

Consider staying stock.
« Last Edit: September 16, 2010, 06:17:11 AM by MCRider »
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Offline orkid1989

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Re: 71 cb750 wheels and tires
« Reply #6 on: September 23, 2010, 12:24:15 PM »
i was wondering which would be best tire size to go on the stock rim?
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Offline MCRider

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Re: 71 cb750 wheels and tires
« Reply #7 on: September 23, 2010, 12:35:10 PM »
Quote from: orkid1989 on September 23, 2010, 12:24:15 PM
i was wondering which would be best tire size to go on the stock rim?
Rear or Front. Best on stock rim IMO is the stock size, premium tire. I don't like the stock ribbed tire on front, prefer some tread pattern.

Rear: Biggest, not necessarily best,  you can go to 4.5in or 120 metric. This would look a little better than the skinny stocker,may wear a little longer.

Front: Biggest , not necessarily best, is 3.5in or /90 metric. These will give a little heavier steering feel, but may feel more comfortable when braking.

These came from a couple of rim/tire fitment charts I have.
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Offline orkid1989

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Re: 71 cb750 wheels and tires
« Reply #8 on: September 23, 2010, 12:42:02 PM »
well in your opinion what do you think would be the best for stock rims? i was just saying largest so the tire wont just crown
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Offline the technological J

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Re: 71 cb750 wheels and tires
« Reply #9 on: September 23, 2010, 12:44:08 PM »
buy a set a tires and ride the beast!... u have all winter to polish or paint get here out while u can!
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Offline orkid1989

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Re: 71 cb750 wheels and tires
« Reply #10 on: September 23, 2010, 12:45:36 PM »
im trying but i want to figure out what size to get
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Offline MCRider

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Re: 71 cb750 wheels and tires
« Reply #11 on: September 23, 2010, 12:51:44 PM »
Quote from: orkid1989 on September 23, 2010, 12:42:02 PM
well in your opinion what do you think would be the best for stock rims? i was just saying largest so the tire wont just crown
Best is subjective, within the rims limits. Well when I was young (like you) i always put the widest tires on it I could. So a 4.50 on the rear and a 3.60 on the front would've been my "best" choice. Perfectly fine and serviceable and safe and all that. They'll crown a little bit, but they may also last longer overall. I liked the look. after all it was soooo powerful!

Now, I'm content with the stock sizes of 4.00 and 3.25. I'd ditch the rib on the front, but keep the size. Bridgestone BT-45s would be good if made in those sizes. No crowning, but if your loaded (with gear) or a person, they'll wear out sooner, maybe.

So, do you want the look? go bigger. Otherwise, stay stock.
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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 orkid1989

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Re: 71 cb750 wheels and tires
« Reply #12 on: September 23, 2010, 06:39:44 PM »
ok thanks. i think i will stick with the stock size
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Offline Duke McDukiedook

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Re: 71 cb750 wheels and tires
« Reply #13 on: September 23, 2010, 08:29:09 PM »
Stock size is best for these bikes.

Download the manual in the faq section and read up.

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