SV Master Cylinder Ratio

[TSM]

What is the ratio of the front & rear master cylinders on the SV??

My front sez 5/8, rear I dunno. Why you ask?

[BillyC]

Why on earth do you want to know that?

[TSM]

Have you never thought of putting a diffrent MC on you front brake to make it sharper & less travel?? For this you need to know the ratio. I was looking at a fireblade MC but because of the year its a 5/8 one, which possably means it will be no diffrent to the SV one.

You're preachin' to the choir. I have very little travel on my stock set up, if it's bled right you can't improve it much more by swopping the M/cyl.

[TSM]

I have hardly any travel on mine either, its more when you come to brake.

Its hard to explain. Its a mod that some people do. I am thinking of tring it, if i dont like it, i change it back and sell what i bought. I am not getting anything expensive just MCs from other bikes.

Originally Posted by TSM

I have hardly any travel on mine either, its more when you come to brake.

Its hard to explain. Its a mod that some people do. I am thinking of tring it, if i dont like it, i change it back and sell what i bought. I am not getting anything expensive just MCs from other bikes.

You want a nice radial one from a recent superbike, or a radial brembo from a 999

[21QUEST]

The ratio is on the master cylinder but as burner says it 5/8.

Ratio is not the only that matters with a master cylinder though. The piston travel , pivot makes a difference.

Some people prefer little travel , some more travel (initial). Personally I like more initial travel as I can modulate the brakes better that way(I brake while turning in). You got to try it and see if you like the change.

I used a CBR600RR master cylinder with the standard caliper for a little while and loved it. Now using it on my 750 end an dit's sweet. Had previuosly tried a fireblade one(200-2001) with GSXR600 SRAD caliper but did not like the way it felt.
A lot is rider preference although you can of course go too far either way.

Since I one for mucking about with stuff on the bike I've got a few knocking around(too many ). Got time on your hand then I've got a TL , fireblade , GSXR1000K3 SV1000 ones you can try out if interested. That should keep you busy All you have to do is pay the postage or pick them up.

Cheers
Ben

[Sid Squid]

The 5/8 marking is an Imperial measurement - 5/8ths of an inch - not the ratio, the ratio is a word used for the relationship between the master cylinder diameter and the caliper piston diameters, and also for the mechanical advantage the the lever has over the m/cyl piston, that is; the distance between the lever pivot and the piston.

For any given system using a larger diameter m/cyl will result in less lever travel, but for any given brake pressure you'll need to squeeze the lever harder, a smaller diameter m/cyl will do the reverse - for any given brake pressure you'll need to pull the lever further but not as hard.

Do you want sharper, (by this I assume you mean better brake pressure for any given lever pressure, is that right?), or do you want less travel? All else being equal, you can have one or the other by changing the m/cyl for larger or smaller.

[21QUEST]

Originally Posted by Sid Squid

The 5/8 marking is an Imperial measurement - 5/8ths of an inch - not the ratio,.

You are quite right I meant to say bore size. Apart from that we are sayng the same thing :P

Cheers
Ben