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Fitting Twin Discs

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Damon
World Chat Champion



Joined: 24 Aug 2007
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PostPosted: 14:08 - 25 Oct 2008    Post subject: Fitting Twin Discs Reply with quote
I am taking the RS off the road very shortly to do some major work to it. Fairing/headlights are going to be removed and race fairing stuck on, engine is going to be worked on and maybe replaced (although i am heading towards just going with a top end with a few extra CC's) + new consumables.

I was thinking about putting two discs on the front wheel but have a few questions. First and foremost, will it be worth it? Money aside, will the improved braking efficiency outweigh the added weight of the extra caliper/disc? And if so, by how much?

The next question is what wheel / fork lowers could i get to fit the RS? without doing anything too major with yolks etc


thanks for all your help,

Damon
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 15:54 - 25 Oct 2008    Post subject: Re: Fitting Twin Discs Reply with quote
Dam0n wrote:
First and foremost, will it be worth it? Money aside, will the improved braking efficiency outweigh the added weight of the extra caliper/disc? And if so, by how much?

With a decently set up single caliper system you should be able to stoppy from 100mph on your bike, I'd say. Don't really need more than that Smile.
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Damon
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Joined: 24 Aug 2007
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PostPosted: 17:28 - 25 Oct 2008    Post subject: Re: Fitting Twin Discs Reply with quote
G wrote:
Dam0n wrote:
First and foremost, will it be worth it? Money aside, will the improved braking efficiency outweigh the added weight of the extra caliper/disc? And if so, by how much?

With a decently set up single caliper system you should be able to stoppy from 100mph on your bike, I'd say. Don't really need more than that Smile.


fair enough, was just a though. i have a nice brembo calper + i use HH sintered pads, steel hoses and good fluid (changed often) anyway so should be ok i suppose. I spend alot of time and money making sure my brakes are tip top. They are the most important thing on my bike IMO


thanks for the reply
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Zimbo
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Joined: 09 Jul 2004
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PostPosted: 18:06 - 25 Oct 2008    Post subject: Reply with quote
It's mostly down to pads really, with Performance Friction pads you should have more than enough brakes. If you do want more consider a master cylinder upgrade (brembo radial 16mm?).
You could also replace the Goldline caliper with a 4 pad P34 for even more power.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 18:09 - 25 Oct 2008    Post subject: Reply with quote
Hi

With decent pads the RS125 has very good brakes. Just try swapping pads first.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 01:41 - 26 Oct 2008    Post subject: Reply with quote
Performance friction are well over-rated on price per performance to my mind; I'd suggest trying Carbone Loraine. They are a reasonable amount cheaper and offer as good performance to my mind.
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Zimbo
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Joined: 09 Jul 2004
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PostPosted: 12:57 - 26 Oct 2008    Post subject: Reply with quote
Quite probabaly true - I made the suggestion as I've raced on asingle 320mm brembo disc and brembo goldline caliper, as fitted to the RS, using PF pads and got on well. I've also raced on Carbon Lorraine SBK3s with the same setup with great results but only with a twin disc conversion, which is why I recommended PF - I've tried it and I know it's up to the job. I also rate Bendix pads, but again I've only used them on a twin disc setup.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 15:33 - 26 Oct 2008    Post subject: Reply with quote
Zimbo wrote:
Quite probabaly true - I made the suggestion as I've raced on asingle 320mm brembo disc and brembo goldline caliper, as fitted to the RS


The RS doesn't have a Brembo caliper. Although thinking about it that might be a worthwhile upgrade (and think they are available with the correct spacing).

All the best

Keith
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Zimbo
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Joined: 09 Jul 2004
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PostPosted: 19:16 - 26 Oct 2008    Post subject: Reply with quote
Do they not? I thought they did (125 at least) but i may well be mistaken lol.
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 20:54 - 26 Oct 2008    Post subject: Reply with quote
Hi

It is a Grimeca caliper, badged Aprilia. They used that caliper from 1998 until the recent upgrade of the RS. Basically the same caliper was used on a load of Gileras (except badged Gilera).

The 1987 model AF1 125 did have a Brembo twin pot sliding caliper.

All the best

Keith
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Damon
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Joined: 24 Aug 2007
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PostPosted: 23:05 - 26 Oct 2008    Post subject: Reply with quote
Kickstart wrote:
Hi

It is a Grimeca caliper, badged Aprilia. They used that caliper from 1998 until the recent upgrade of the RS. Basically the same caliper was used on a load of Gileras (except badged Gilera).

The 1987 model AF1 125 did have a Brembo twin pot sliding caliper.

All the best

Keith


I have the recent RS125 - i too thought it was a brembo goldline caliper. Thanks for all your replies, i will look into getting some decent uprated brake pads and leaving the conversion alone.

karma given Thumbs Up
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Kickstart
The Oracle



Joined: 04 Feb 2002
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PostPosted: 09:40 - 27 Oct 2008    Post subject: Reply with quote
Kickstart wrote:
It is a Grimeca caliper, badged Aprilia. They used that caliper from 1998 until the recent upgrade of the RS.


Meant to say 1988, not 1998.

As mentioned I think Brembo make calipers with the same spacing (from vague memory used on the Monsters with the cheaper suspension) which can be fitted fairly easily.

All the best

Keith
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