Author Topic: Lowering and or Dumping a CB750 (Read 13914 times)

VJ400 · « **on:** February 24, 2011, 01:16:00 PM »

Ok. Im going to start off by saying Im very new to this. I have no idea what Im doing. So now that thats out the way, Im trying to figure out how to lower my bike.

Also can I have this stance vvv

Without going to that solid bar. Do they make a rear suspension that has increased spring rates? And what about the front? How does that work? And how do you increase the dampening and or stiffness?

Trying to go from this

to this

Really? · « **Reply #1 on:** February 24, 2011, 03:34:04 PM »

Looks like the major things they did were to use struts on the back that are short and the front is raked. I do not know if they used shorter tubes or not.

Momma's (in sig) has shorty shocks on back and -2 CycleX tubes and the tubes are slid up 1 1/4 inches. Changed the rear rim from the stock 18' to a 16".

Those bikes look quite kewl. Wonder how they handle with the rake.

SKTP · « **Reply #2 on:** February 24, 2011, 03:47:24 PM »

Interesting look....I bet it drives like crap...I do like the chrome oil tank...its like a cheater way to clean out the triangle

Really? · « **Reply #3 on:** February 24, 2011, 04:01:41 PM »

It is kinda like the CycleX sport bobber thingamajig but using the stock frame.

Roach · « **Reply #4 on:** February 24, 2011, 04:21:21 PM »

the only way you are going to lower the bike in the rear that low is by a solid strut. as for the front looks to me like they did a couple things such as change the rake on the head tube and probably drop the forks about an inch in the trees

6adan · « **Reply #5 on:** February 24, 2011, 04:41:21 PM »

I had a Goodyear tire like on one of those bikes back in the 70's, it was terrible.Only had it for a short time.

VJ400 · « **Reply #6 on:** February 24, 2011, 06:32:21 PM »

Quote from: Roach on February 24, 2011, 04:21:21 PM

the only way you are going to lower the bike in the rear that low is by a solid strut. as for the front looks to me like they did a couple things such as change the rake on the head tube and probably drop the forks about an inch in the trees

where do i get a solid strut from. It would be nice if they did coilovers for bikes. That way i could get higher spring rates and adjustable dampening and all that awesome stuff. I can already see this is going to be harder than i thought. Also how do you change the rake? I guess I dont have the eye yet to see that the rake was changed on those bikes.

Roach · « **Reply #7 on:** February 24, 2011, 06:51:33 PM »

well what i think they did is chopped off the head tube and changed the angle and re welded it on.

as for the rear end going with something adjustable while staying that low is hard to do because the wheel wants to move up and down and the only place it has to go is into the back of the seat chewing it up and spitting it out. most guys make the solid strut for that reason. You will probably have to make the strut yourself. the reason for the strut is so they don't have to throw a hardtail on it and can easily put suspension back on the rear.

Ryan6838 · « **Reply #8 on:** February 24, 2011, 07:00:46 PM »

If you want to keep some shocks on the rear shorty shocks, lowering blocks and a 16 wheel should drop you pretty good

Goofaroo · « **Reply #9 on:** February 24, 2011, 07:33:18 PM »

Dropping the rear is a piece of cake. Your hurdle is that you have stated that you have no experience and are new to all of this so properly altering the steering head angle seems outside of your realm. If you are extremely determined to spend countless hours and piles of cash trying to duplicate the bikes in the photos, then you need to find a frame builder in your area that can get you started in the right direction. It will never handle or ride worth a tinker's damn but at least it won't be a death trap if someone does the frame modifications properly. A local bike shop could probably refer you to someone in your area that could perform the work.

seanbarney41 · « **Reply #10 on:** February 24, 2011, 07:41:16 PM »

title might end up reading...lowering and then dumping

Hinomaru · « **Reply #11 on:** February 24, 2011, 08:01:15 PM »

Good reading about frame alterations and probably more than you wanted to know:

http://www.hondachopper.com/garage/frame_alterations/frame_alterations_1.html

Grabcon · « **Reply #12 on:** February 24, 2011, 08:38:08 PM »

The question you need to answer is why? Are you to short and you can't reach the ground or do you like the look, do you want a rideable bike when you are done? What type of riding?

All of these things and more will influence what you want to achieve.

Since you stated you don't know what you are doing follow the like for some light reading about steering geometry. You got to be safe when you ride get educated on the bike.

http://www.carbibles.com/suspension_bible_bikes.html

singedebile · « **Reply #13 on:** February 25, 2011, 07:12:41 AM »

anyone know what kind of wheels those are on the bike in the background? (the gold ones)

Coyote13 · « **Reply #14 on:** February 25, 2011, 07:44:25 AM »

Shoot Yoshi at Garage Company an e-mail (those are his bikes). From what I hear he's a very friendly guy. If you've never been on their site, check it out, the guy's got an amazing stash of old bikes and parts. Lots for sale, lots not, but cool to look at anyways.

Side note: pretty sure both of those bikes are for sale

somesuch · « **Reply #15 on:** February 25, 2011, 07:52:55 AM »

Quote from: singedebile on February 25, 2011, 07:12:41 AM

anyone know what kind of wheels those are on the bike in the background? (the gold ones)

I think they are Kimtab snowflake wheels.

--Nick

VJ400 · « **Reply #16 on:** February 26, 2011, 12:52:25 PM »

Quote from: Grabcon on February 24, 2011, 08:38:08 PM

The question you need to answer is why? Are you to short and you can't reach the ground or do you like the look, do you want a rideable bike when you are done? What type of riding?

All of these things and more will influence what you want to achieve.

Since you stated you don't know what you are doing follow the like for some light reading about steering geometry. You got to be safe when you ride get educated on the bike.

http://www.carbibles.com/suspension_bible_bikes.html

No I'm about 6'3 so height is not an issue. The look is what I like, and yes i would like to ride the bike when its done. The slammed look has always been what i wanted but i was not sure the work that was involved with it. I'm trying to keep from destroying the bike from cutting and re welding parts of the frame. But i would like for it to sit as low as possible. I would only want to change the rake for clearance reasons.

Roach · « **Reply #17 on:** February 26, 2011, 01:20:37 PM »

welcome to the world of custom bike building there will be a bunch of cutting needed to get that look. but if you got the money anything is possible. but remeber like others said your ridability will go out the window

VJ400 · « **Reply #18 on:** February 26, 2011, 01:22:10 PM »

Quote from: Roach on February 26, 2011, 01:20:37 PM

welcome to the world of custom bike building there will be a bunch of cutting needed to get that look. but if you got the money anything is possible. but remeber like others said your ridability will go out the window

Well for sure this bike will only be an around town bike. I have my s14 for performance and fun.

754 · « **Reply #19 on:** February 26, 2011, 01:37:04 PM »

I have a similar set up 750 with a 6 over swingarm and struts.

I am not convinced these bikes are raked, but may have more rake. By lowering the rear of mine more than the front, the rake is greater, but frame has not been cut..

I am working/thinking on a cool design for struts with 1- 1.25 inches of travel.. very cool looking, trying to get a buddy with a CNC to work with me on it..

Really? · « **Reply #20 on:** February 26, 2011, 01:53:44 PM »

I wonder how it rides at 70 or 80. I like the crotch bobber look and this would prolly be cheaper to build than starting with an $800 CycleX frame.

seanbarney41 · « **Reply #21 on:** February 26, 2011, 02:15:14 PM »

I've ridden Harley's with struts at 60 or 70 mph before and they ride as good or better than ...well...a stock harley(not saying much here

)

754 · « **Reply #22 on:** February 26, 2011, 02:16:38 PM »

Its longer but easier to ride once rolling you can take hands off bars in 2nd gear at 45mph and coast down to 15mph.
It pretty well never fishtails under full power starts, and eliminates most ticket producing wheelies..

And the CG is so low, I can grab the center of the bars with one hand, and push and STEER it, on level ground.. try that with a stocker...
And I can still put on a respectable amount of miles in a day, over 500..

Old Scrambler · « **Reply #23 on:** February 26, 2011, 02:34:56 PM »

I only note that what you want to do deserves a much less desirable original bike to alter...........That looks like a fairly original K2 and may bring a good price if it was clean, shiney, and ran well. You don't have to rake the frame........just get a different triple-tree and 37mm or larger tubes..........Lots of work. I'd sell what you have and buy one already built.

NitroHunter · « **Reply #24 on:** February 26, 2011, 03:02:32 PM »

With a raked neck the ride is extremely stable at any speed above walking... maneuvering is another issue.
With the struts on, mine was like riding on a buck board - or my old sportster, take your pick. A cushier seat would have helped...

It's a much better ride with shocks.
20" seat height, 34 degree rake, 6+ swingarm, struts, and a steering stabilizer, I've ridden mine at 143mph at the strip - and then home.
It's all in what you like!

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Author Topic: Lowering and or Dumping a CB750 (Read 13914 times)

Hinomaru