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Torque arm
http://ducatittandf1.com/viewtopic.php?f=10&t=11366		 Page 1 of 1
Author:  flattop900 [ Tue Jun 07, 2016 11:33 am ]
Post subject:  Torque arm
Hello....
Can anyone explain the advantages of having the torque arm set-up on the rear brake caliper bracket?
Thank You...
Flattop900
Author:  618F1 [ Wed Jun 08, 2016 3:18 pm ]
Post subject:  Re: Torque arm
OK, I will give it a go: I think it prevents the torque created by braking from moving the swingarm, leaving the suspension to do what it needs to at the moment. MikeV

Where is Kevin Cameron when you need him?
Author:  flattop900 [ Wed Jun 08, 2016 11:13 pm ]
Post subject:  Re: Torque arm
Hi Mike...
Those torque arms use to be quite common, but it seems most manufactures have moved away from them. I'm making up a bracket and wondered if it is worth going in that direction or just machining a slot. Who knows, maybe ten years from now they'll be all the rage again.
Thank you once again...
Flattop900
Author:  618F1 [ Thu Jun 09, 2016 11:26 am ]
Post subject:  Re: Torque arm
Besides electrical systems, suspension is another mystery to me. Maybe the brake trailing rods are simply not needed on the modern rising-rate suspensions. And, it seems more coaches and trainers insist they seldom use the rear brake. I put one on the LS clone because it was a cool way to locate the caliper on the small, 220mm, rear disc. MikeV
Author:  nick gill [ Mon Jun 27, 2016 12:04 am ]
Post subject:  Re: Torque arm
flattop900 wrote:
I'm making up a bracket and wondered if it is worth going in that direction

Bracket is available from Old Racing Spares if you want a short-cut:
Image
Author:  ducadini [ Mon Jun 27, 2016 8:45 am ]
Post subject:  Re: Torque arm
Couldn't figure out the dynamics of the floating caliper so discarded it in favour of an easier rear wheel change with a fixed setup.
Did it pull the rear UP while braking (not good cause it would tend to take it of the deck) or did it push the bike UP while braking (not good cause all the weight WAS already on the front fork).
What's the use of an rear disc if You're braking so hard the rear willcome of the ground or the tire will start dribbling due to engine backshifts.
I fitted a rear disc to get through tech-control but can't recall using it.
There even was a guy on a Laverda 750 (ish) that fitted an aluminium disc of 3 mm, just for tech-control because he knew that in use it would crumble. Zanzani was a bit out of (financial) reach for us BOT mortals.
Of course this was BSC (before slipperclutches) and ADFD (antidivefrontdevices) and TRB (thumbrearbrakes).
WILL digg in "Motorcycle Chassis Design and Construction" to find some answers later.

ciao
ducadini
Author:  618F1 [ Mon Jun 27, 2016 11:29 am ]
Post subject:  Re: Torque arm
Carlo's version is a much better replica of the original. Somehow a cnc'd part always looks wrong to me if you are trying to look vintage. And, since most all are for a 260mm disc sometimes you must make your own. MikeV
Author:  nick gill [ Tue Jun 28, 2016 6:12 am ]
Post subject:  Re: Torque arm
618F1 wrote:
Somehow a cnc'd part always looks wrong to me if you are trying to look vintage.

I absolutely agree. I shot peen or garnet blast these kind of parts to make them appear cast. The CNC is great for super low volume production but it doesn't half make everything look Motocorse.
The 'factory look' is my motto.
Author:  flattop900 [ Tue Jun 28, 2016 9:25 am ]
Post subject:  Re: Torque arm
Hello...
Everyone seems to be one the same page as myself. I'm going with a 220mm disc. I only use the rear brake at very slow speeds (especially on grass and gravel) and I also try to remove all of the tooling marks.
Regards...
Flattop900
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