Interesting cailper option for 12" disc

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Interesting option but confusing upgrade to me who with just corrected restricted factory set up knows its really the tire size and wheel inertia that limits C'do slowing not more brake system power which just lightens pilot squeeze to actually make a bike more dangerous to really slow when great need suddenly arises no fault of your own expect going out riding peacefully. Real racers or those blasting Mt roads at illegal speed do need the thinner friction bands so heat is more evenly developed across it by smaller pucks lined up to avoid rotor distortions.
 
I talked to them a few weeks ago about this. If you look at the pictures of the caliper itself it looks backwards (left hand behind slider). I could not get a straight answer from them about whether this actually fits Classic Nortons. It looks right in the picture with the wheel so I just came away confused.
 
dennisgb said:
I talked to them a few weeks ago about this. If you look at the pictures of the caliper itself it looks backwards (left hand behind slider). I could not get a straight answer from them about whether this actually fits Classic Nortons. It looks right in the picture with the wheel so I just came away confused.
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Classic Nortons ? Well at least it is not a drum brake. You'd need a set of reservoir type rear shocks to go with it.
 
acotrel said:
dennisgb said:
I talked to them a few weeks ago about this. If you look at the pictures of the caliper itself it looks backwards (left hand behind slider). I could not get a straight answer from them about whether this actually fits Classic Nortons. It looks right in the picture with the wheel so I just came away confused.
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Classic Nortons ? Well at least it is not a drum brake. You'd need a set of reservoir type rear shocks to go with it.
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I didn't know any other way to describe it. The way they presented it to me was that it was for the "New" Norton...yet the details are describing Commando. Look at the pictures and you will see what I mean...when they contacted me they couldn't explain why the caliper looks like it is backwards...or whether it would fit Commando or not.
 
dennisgb said:
acotrel said:
dennisgb said:
I talked to them a few weeks ago about this. If you look at the pictures of the caliper itself it looks backwards (left hand behind slider). I could not get a straight answer from them about whether this actually fits Classic Nortons. It looks right in the picture with the wheel so I just came away confused.
Click to expand...

Classic Nortons ? Well at least it is not a drum brake. You'd need a set of reservoir type rear shocks to go with it.
Click to expand...

I didn't know any other way to describe it. The way they presented it to me was that it was for the "New" Norton...yet the details are describing Commando. Look at the pictures and you will see what I mean...when they contacted me they couldn't explain why the caliper looks like it is backwards...or whether it would fit Commando or not.
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I don't understand what you mean by it 'looks like its backwards'... what do you mean?
As for fitment application, the picture I showed in the opening thread is from their web site and shows it fitted to a 'classic' Commando. Their site show a caliper for the F1 Norton (rotary) and caliper part number P805 is for the Commando.
Perhaps you spoke to the office cleaner or something!?
 
bwolfie said:
It "looks" backwards because it's pictured on a MK3 Commando, LH caliper mounting.
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Yes but that has nothing to do with the caliper design does it?
 
Did you look at the picture I linked to in my previous post? It shows left hand mount behind the slider. Commando is right hand mount behind the slider or left hand mount in front of the slider.

The image of the caliper mounted is right hand mount even though its on the left side of a MKIII which is correct. The picture of the caliper is not right hand...it is left hand (backwards). The mounting holes are on the wrong side. Don't know how to make that any clearer. Look at the picture of the caliper in my post.

They couldn't explain why the picture shows it wrong...maybe it is the wrong picture or someone reversed it on the web...whatever, but it is wrong and made it difficult to trust that the part would be right.
 
Interesting cailper option for 12" disc
 
I would guess that it needs to be mounted at the front of the fork leg ( ie on the left on a Commando) because it's such a long calliper and it need to be "pulling" on the forks leg as you brake, not pushing on it. If that makes sense :)
 
The caliper looks too long for the mounting points used. I wouldn't be surprised if there was significant flex at the opposite end of the caliper to the mounting points, regardless of correct fitment to a Commando.
 
bwolfie said:
It "looks" backwards because it's pictured on a MK3 Commando, LH caliper mounting.
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The mounting to the Commando is the same either side because the fork leg is the same. It is a right mount fork leg when compared to other motorcycles. On the earlier Commandos the brake is mounted behind the fork leg on the right side. On the MKIII it ends up on the front of the fork leg on the left side. The caliper is the same in either position.
 
pommie john said:
I would guess that it needs to be mounted at the front of the fork leg ( ie on the left on a Commando) because it's such a long calliper and it need to be "pulling" on the forks leg as you brake, not pushing on it. If that makes sense :)
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Front or back makes no difference (although behind the leg is preferred). The mounting holes on the caliper in the Pretech picture are on the wrong side to match the Norton slider no matter which side you put it on.
 
With a caliper that long, if it were mounted on the back of the forks, you would need a heavily kinked mudguard brace
 
dennisgb said:
Interesting cailper option for 12" disc
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I get your point now Dennis, looking at it, I reckon they've just got that picture of the black caliper (on its own) the wrong way around, because as you say, it just won't fit in either orientation!
I still think it is a good option, I've currently got a Grimeca caliper on a RGM caliper bracket and this Pretech caliper a is lot lighter and neater than my current set up by a long way. And, of course, it will be a tad better brake too.
They're £230.
 
Apart from looking pretty damn ugly, its a solution to non-existent problem. A good single pot or twin is more than sufficient with a larger diameter than stock disc and stiffer too.
 
Fast Eddie said:
dennisgb said:
Interesting cailper option for 12" disc
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I get your point now Dennis, looking at it, I reckon they've just got that picture of the black caliper (on its own) the wrong way around, because as you say, it just won't fit in either orientation!
I still think it is a good option, I've currently got a Grimeca caliper on a RGM caliper bracket and this Pretech caliper a is lot lighter and neater than my current set up by a long way. And, of course, it will be a tad better brake too.
They're £230.
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Yes and when I emailed them they couldn't explain it which was strange. I thought they would say the picture was just a stock photo or something, but they didn't. Made me uncomfortable that they would ship the wrong caliper if I ordered it.

I have to believe that they have the proper caliper otherwise they wouldn't have it listed.
 
ML said:
Apart from looking pretty damn ugly, its a solution to non-existent problem. A good single pot or twin is more than sufficient with a larger diameter than stock disc and stiffer too.
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Have to say the difference between the standard disc set up and stopping distance of your average road vehicle makes the Norton/Lockheed braked bike an accident waiting to happen. Getting an effective master cylinder/caliper ratio is number one priority. Larger disc and pad surface area help too. I agree regarding stiffness and the Pretech looks awful.
 
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