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Old 10-21-2013, 08:37 PM   #1
sidecarcrazy OP
grandad in gladstone
 
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Joined: Jun 2006
Location: Aussie Land
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Leading link tube sizes

Been looking through the leading link thread for the following info & can not seem to find it.
I need the info for a set of LL for a K1100 ie:
Tube type to buy
Outside diam will need to be resized to 41.35 mm
Tube wall thickness ?
That is all the info I need please if someone can help me ?
An old fart in Australia
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Old 10-21-2013, 11:24 PM   #2
3legs
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I use hollow bar on my k1100. It's smaller than the OD of the original but I get sleeves made up and weld the sleeves to the bar. When I get time I will try to get accurate dimensions for you but from memory the bar is 6mm thick and about 33 mm od. It's heavy but it won't break.

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Old 10-22-2013, 07:37 AM   #3
jaydmc
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On our leading links we start with 1.5 inch .120 wall DOM tubing, we slide a 1.25 .120 wall DOM tube down the center before bending making for a double wall. We then machine sleaves for the triple tree's but taking 1.75 .120 wall DOM tubing and machining the O.D. the same as the fork tube on the bike. Once machined down we put a slit in the sleaves and use them as shims. For us this works well as our tooling is all set up to work with these sizes so our down tubes can be made the same for all of the different leading links we build making it possible to use much of the same tubing.
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Old 10-22-2013, 12:13 PM   #4
arbalest
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K1100 fork tube diameter

Sidecarcrazy,

The measurement you have is correct, but a little misleading. I needed very short tubes between the triple trees on my K100, and 1 5/8" is as close to perfect as you'll find.

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Old 10-22-2013, 04:32 PM   #5
FR700
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The 1100 runs slightly larger diameter tubes than the 100.

Also the 1100's run a different design of triple trees. The lowers are a gull design and each clamp point ( all four ) has two pinch bolts.
Between the gull spreading the clamping distance and the extra bolts they are a superior design.

Even the bar risers are spread further apart to take away that sensation of the bars twisting in the bushes.
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Old 10-22-2013, 04:55 PM   #6
claude
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Using stock triple trees we use 1 1/2 x .120 wall with 1 1/4" x .120 inside as Jay mentioned. The spacer sleeves are machined to fit inside the triple trees and are split to allow proper clamping. We do not weld the sleeves to the tube but do them with a lip on them to locate them properly. This basic idea is not a new design by any means and has been effectively used on various leading link systems over the years. Not saying that 1 1/2 " etc are THE trick sizes to use but these sizes work with most applications. Some have argued that the double wall design is better than a single heavy wall tube.
Depending on tire/wheel etc. widths the tubes may be splayed apart for wheel travel and clearance.
Down tubes should be connected together, we feel, for total rigidity of the assembly.
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Old 10-23-2013, 12:30 AM   #7
sb_250y
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A popular fabricator in Australia used:

upper fork legs- ASSAB 750V 45/20 Hollow Bar.

on his leading links.
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Old 10-23-2013, 12:54 AM   #8
sidecarcrazy OP
grandad in gladstone
 
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Fork tube

Thank you sb_250y that is the info I am after.
Now, because I live in rural South Australia, who knows where I can by 2 pieces of this tube each 1 meter long and have it posted to me ?
Or an address & phone number in Adelaide & I can go down & buy it next time I am down there.
Or buy it for me & post to me, can pay via bank deposit/transfer, credit card & Paypal.
Waiting for reply

PJ
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Old 10-23-2013, 01:00 AM   #9
sb_250y
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http://www.buau.com.au/english/b_2443.htm

I'm certain they'll sell by the metre as it is specialised steel
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Old 10-23-2013, 01:33 AM   #10
3legs
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Yep. That's where I bought mine from. The were opposite the Pooraka fruit markets on diagonal rd. From memory didn't cost that much. Around $35 metre (although that was around 5 years ago).

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Old 10-24-2013, 06:19 PM   #11
bbjay
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Quote:
Originally Posted by sb_250y View Post
A popular fabricator in Australia used:

upper fork legs- ASSAB 750V 45/20 Hollow Bar.

on his leading links.

PJ

I have a account with bohler steel ,, If you ley me know exact size you want i can get you a price ,, The 750v is the steel i used for my strom fork legs ended up around 7m/m thick after machining they were heavy but stronger that way

Bernie
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Old 10-24-2013, 06:22 PM   #12
bbjay
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PJ

just looked on my tube chart for 750v and 45o/d and id either 32/28/20 dont quote me on that i would have to check with bohler

B
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Old 10-24-2013, 11:32 PM   #13
sidecarcrazy OP
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bbj

Thank you, will pm you, thanks to all replies, much appreciated
PJ
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Old 10-25-2013, 07:09 AM   #14
Melrone
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Good luck,will be interesting to see it build.Too bad your're so far away because I have a Unit Leading Link front end for sale..Its fits a K1100 or any other older K- bike.. Good Luck
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