K2 / Proflex Riders Group

General => Tech Forum => Topic started by: Simon on December 29, 2004, 01:16:32 am

Title: Revised revised floating brake.
Post by: Simon on December 29, 2004, 01:16:32 am
OK now I've tried my floating brake system it just didn't work as well as I hoped [smiley=worry.gif],it tended to jack up the back on heavy braking and stiffend the suspension action,pretty good on fast stutter bumps with light braking,looking at my system its quite obvious that mounting the torsion rod at an upward angle to the top shock mount would cause this,had a scour through the net on floating brake systems and came across a company called Brake therapy makers of retro fit systems (I'm sure someone has mentioned them on this site before),contacted their designer (Brian) and showed him my system,he confirmed my suspicions and said I had to either lenghten the pivot arm or lower the anchor end and this would give a neutral operation to the system and I would then see all the benifits of such a system,I had a look at the systems Brake therapy made and this gave me a good idea of the angles required,excuse all the pic's it just explains things better.Haven't tried it in anger yet but it feels much better just trying it out on the road,also on the plus side there's no weight gain as the shortened torsion rod and some extra slots in the rod removed more weight than the new mounting bracket. [smiley=nod.gif]
Simon.
(http://idriders.com/proflex/galleries/Simon/PHTO250.jpg)
(http://idriders.com/proflex/galleries/Simon/PHTO251.jpg)
(http://idriders.com/proflex/galleries/Simon/PHTO252.jpg)
Title: Re: Revised revised floating brake.
Post by: zulu on December 29, 2004, 02:15:14 am
 ;) Great pics. I like to see others projects as they go.
Keep up the good work. 8)
Title: Re: Revised revised floating brake.
Post by: Carbon_Angus on December 29, 2004, 05:51:28 am
awesome work, Simon!

When does your super-stud-racer-son get one for his bike?

[smiley=beer.gif]
Title: Re: Revised revised floating brake.
Post by: Mega-oZ on December 29, 2004, 08:46:56 am
Quote
awesome work, Simon!

When does your super-stud-racer-son get one for his bike?

[smiley=beer.gif]

I'm not getting a floating disc brake :(
though my dad has got a different idea for my bike which you will have to find out about later [smiley=laughing.gif], may take awhile though.
Mega-Oz
P.S my dad's bike does look good but he is a bit mad ;D.
Title: Re: Revised revised floating brake.
Post by: Old Proflexer on December 29, 2004, 12:35:26 pm
Simon,

I'm out of my league here but I was wondering if the front derailler post could be modified or recreated in such a way as to hold the derailler and have a removable plate come up the back spine of the seattube and rest against the carbon to hold the forces generated.  Similar to the upper plate you made and maybe rest in a notch or such in the spine.

That would lower the arm position on the frame -

just a thought

OP
Title: Re: Revised revised floating brake.
Post by: Simon on December 29, 2004, 07:55:45 pm
Op I've seen your work and your not out of your league here ;D,must admit that idea never crossed my mind but it sounds entirely feasible and by running the length of the spine you could have more than 1 mounting point so you could effectively tune the brake to varing conditions,

Thanks for the comments this bracket is pretty much permanent,its rivited and bonded on,it took a lot of soul searching before I got the courage to drill that frame [smiley=worry.gif]I think that is pretty much it on the floating brake system its been a great project to do if not abit more involved and frought than I origionally anticipated, no doubt there will be some more tweeks on it as time goes by,
Carbon Angus, super-stud-racer-son, thats gone to his head :P [smiley=laughing.gif] but the next project will be his bike though.
[smiley=beer.gif] [smiley=beer.gif]
Simon.