Received today.

Got this bad boy delivered from Italy today. RCS 17 with Brembo master cylinder kit. Ordered from Carpi Moto Saturday and delivered today, great service and price. Going on an SP with HEL hoses. Beautiful piece of kit, might just put in a glass case and stare at it.

 

What's the cost delivered to the door please? And why 17 RCS, isn't it normally 19rcs people choose?

 

Worked out at €288 to the door or about £220 in English money. Advised by Brembo to go for the 17 due to the smaller pistons in the calipers., will give better feel.

 

Let us know what the RCS17 is like ... I was going to get the RCS19 myself shortly.

 

I also agree, I don't see the point having a 19mm M/C piston unless your calipers have 36mm+ pistons

 

Will do its being fitted 4th April, with HEL brake lines.

 

SP has M4s with 32 and 30mm pistons, the same size in fact as the OEM callipers, OEM master is 17.5mm! When people change to 19mm they get a firmer lever given that the piston is bigger. A piston smaller than 17.5mm would give more power but more travel and less feel, it's all about ratios..

The formula you need is:

MC Piston Area i.e. Area of a circle =(3.1416 x piston diameter squared)/4

Master / Slave = Ratio

For example:

Standard M4 monoblocks 34mm 7263.4 / 283.53 = 25.6:1 ratio. Nice ratio.

Modulation Characteristics:
30:1 - soft
27:1 - sweet spot
23:1 - firm
20:1 - wooden

 

If the piston sizes are the same does that mean the only difference is the name on the outside?

 

Well, build quality and fulcrum, I.e pivot point, don't know what OEM is off hand but you can change the RCS from 18 to 20mm, 18 for race and 20 for road..