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Offline greenjeans

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fork brace measurement needed
« on: November 25, 2008, 06:23:14 PM »
I have a buddy that will try and make a simple aluminum fork brace if I can get some measurements....

Specifically for a 72 cb750K  (It would be simple to do other models with measurements....

Anyway, guess all we'd need are the centers of the fork tubes and what would be appropriate for the diameter to be
Should it be 35mm compressed (tightend down) ?  How much would you allow to get it to slide over the tubes easily and
still be tightened ?

Is there a specific grade of aluminum that could be preferable over another ?

I could have sworn I had an old Honda frame drawing with measurements, but after tearing through my shop for the last
hour, I can't find it.

And finally, what do you guys think would be a fair price for an aluminum fork brace ?  Not that he'd go into business making them, but I' sure we could knock out a decent stash of them for our CB brothers.

I'll try and post some drawings when we get that far.

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Offline MCRider

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Re: fork brace measurement needed
« Reply #1 on: November 25, 2008, 06:41:21 PM »
Quote from: greenjeans on November 25, 2008, 06:23:14 PM
I have a buddy that will try and make a simple aluminum fork brace if I can get some measurements....

Specifically for a 72 cb750K  (It would be simple to do other models with measurements....

Anyway, guess all we'd need are the centers of the fork tubes and what would be appropriate for the diameter to be
Should it be 35mm compressed (tightend down) ?  How much would you allow to get it to slide over the tubes easily and
still be tightened ?

Is there a specific grade of aluminum that could be preferable over another ?

I could have sworn I had an old Honda frame drawing with measurements, but after tearing through my shop for the last
hour, I can't find it.

And finally, what do you guys think would be a fair price for an aluminum fork brace ?  Not that he'd go into business making them, but I' sure we could knock out a decent stash of them for our CB brothers.

I'll try and post some drawings when we get that far.
The problem is there is little meat at the top of the old style fork legs to clamp on to unless you use the whole flange and lose the groove that holds the boot/dust cover.

It would be cool for the brace to index in to that groove and then provide someting on the top of the brace for the boots/dust covers to fasten to.

Telefix has braces for this model fork, but I've heard they are pricey.
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Offline greenjeans

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Re: fork brace measurement needed
« Reply #2 on: November 25, 2008, 07:02:35 PM »
I was just thinking about that....I figured that these would be for the cafe guys, or idiots like me who don't
always run a front fender.   But I agree, it would be great to have something that the fork boot could attach to -
we were just trying to keep tha machin time to a minimum for starters.

Measurements anyone ?
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Offline bgfootball67

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Re: fork brace measurement needed
« Reply #3 on: November 25, 2008, 07:04:59 PM »
The Telefix fork brace is expensive and takes for ever to get, but is a damn nice piece....





I would get measurements, but bike is up for the winter in a heated shop (no access at this time)...
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Offline 78 k550

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Re: fork brace measurement needed
« Reply #4 on: November 25, 2008, 08:05:10 PM »
that look's like a realy nice brace.
Did you do that polish job?
Very nice looking bike.

Paul
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Re: fork brace measurement needed
« Reply #5 on: November 25, 2008, 08:37:54 PM »
How much are the telefix fork braces??  Any recommended sources?
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Offline 73nancy

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Re: fork brace measurement needed
« Reply #6 on: November 25, 2008, 08:45:54 PM »
well i can get some info off my bike tomarow. what excactly do you need for measurements? mine is a 71 cb750 which i think has the same forks right?
ps. im also looking for a fork brace for my cafe so if you do build some i will def be interested in buying one from you.
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Offline MCRider

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Re: fork brace measurement needed
« Reply #7 on: November 26, 2008, 02:54:01 AM »
Quote from: 78 k550 on November 25, 2008, 08:05:10 PM
that look's like a realy nice brace.
Did you do that polish job?
Very nice looking bike.

Paul

+1 on all that! I've been wanting to see a close up of that brace! The builder of "Excess" cafe racer had one but couldn't see it well in his pictures.

Oh Football, that's you! Thanks for posting. Care to share the price?PM if shy.

Since I'm using a 17" front wheel, I could hang a fender underneath. I'm excited.
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Offline MCRider

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Re: fork brace measurement needed
« Reply #8 on: November 26, 2008, 03:00:31 AM »
Quote from: greenjeans on November 25, 2008, 07:02:35 PM
I was just thinking about that....I figured that these would be for the cafe guys, or idiots like me who don't
always run a front fender.   But I agree, it would be great to have something that the fork boot could attach to -
we were just trying to keep tha machin time to a minimum for starters.

Measurements anyone ?

There would be some interest in an economical piece. dust boots are not necessary for a true street racer that won't have a lot of exposure. I'll bet the extra cost of the Telefix piece has to do with the provision for the dust cover mount.

My fork is not together so I can't help with dimensions, but I will if I get there.

The center to center would be the same as the c to c of the lower tree. Then you need the dia of the top of the fork leg. I'll see what I can this weekend. But you also need the rise to clear the 19" tire.
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1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
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Offline greenjeans

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Re: fork brace measurement needed
« Reply #9 on: November 26, 2008, 08:16:19 AM »
Anybody know that measurement for certain ?    Trying to get a really really accurate measurement
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Offline doobiebro

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Re: fork brace measurement needed
« Reply #10 on: November 26, 2008, 10:26:59 AM »
The center to center measurement on my 1977 750K is 182mm with 35mm fork tubes.  I have written down another measurement of 56mm that I think may be the diameter of the fork lowers.  I believe most of the SOHC 750s were the same, but cannot be certain.
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Offline MCRider

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Re: fork brace measurement needed
« Reply #11 on: November 26, 2008, 10:56:02 AM »
Quote from: doobiebro on November 26, 2008, 10:26:59 AM
The center to center measurement on my 1977 750K is 182mm with 35mm fork tubes.  I have written down another measurement of 56mm that I think may be the diameter of the fork lowers.  I believe most of the SOHC 750s were the same, but cannot be certain.
The C to C may be the same. But the top of the lower leg is smaller diameter on the bikes we are talking about ie pre-1972 CB750K. For your year, Honda made the leg taller (to hold more oil) and it cleared the tire. They made the top of the fork leg diameter larger to accept a larger fork seal.

Fork braces for your year are readily available from many sources. For the early CBs however, the fork leg top was below the top of the tire making a straight across fork brace impossible, as well as the diameter issue, which gives less clamping area. The brace must be built with a high arch to clear the tire.

Hence the thread. Thanks anyway.  :)
« Last Edit: November 26, 2008, 10:57:43 AM by MCRider »
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Offline 73nancy

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Re: fork brace measurement needed
« Reply #12 on: November 26, 2008, 01:14:28 PM »
well i got my bike out but i cant get a messurement from mine without my dist boots off i think. i have the fender and everything on right now. so how do i go about taking the boots off? i would be glad to messure it for you. i could get a cailper reading if you want but that will be after thanksgiving next week sometime.
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Offline bgfootball67

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Re: fork brace measurement needed
« Reply #13 on: November 26, 2008, 06:36:06 PM »
I found the brace out of Germany, Telefix.  It took 3 1/2 weeks to get here from Wild Hair Accessories and cost an arm and a leg.  There are 3 American dealers, Spec II and Bob's BMW had piss poor service.  Irfan at Wild Hair Accessories hooked me up the same day, good stuff.....  http://www.whaccessories.com/

http://www.telefix-products.de/

Cost me $220 + $20 shipping from Germany

Few more pics











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Offline MCRider

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Re: fork brace measurement needed
« Reply #14 on: November 26, 2008, 07:30:21 PM »
Very nice. THe best pieces don't come easy.
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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."
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