GT/GTS Brake Upgrade
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Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Tue Jan 02, 2018 11:15 am quote
I found a good photo of the MP3 caliper carrier

vespa 004.jpg

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Tue Jan 02, 2018 12:44 pm quote
This also looks like a 240mm disc, with a Frando F101 caliper

29442597kz.jpg

Banned
2:6
Joined: 11 Jan 2007
Posts: 7383
Location: San Francisco
Sat Jan 06, 2018 12:17 pm quote
That disk looks like it may even be larger than 240, if those are 13" rims.

I got the MP3 caliper mount in the mail, but they sent the wrong side, grrr

IMG_2247.png

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Sun Jan 07, 2018 8:04 am quote
oopsclunkthud wrote:
I got the MP3 caliper mount in the mail, but they sent the wrong side, grrr
Does it look like it will work (if it was mirrored)?
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Tue Jan 30, 2018 11:40 am quote
AnnDee4444 wrote:
The front caliper carrier on a MP3 looks very similar to the GTS... any chance this would be a direct swap for the larger disc & caliper? I can't seem to find any good photos of one.
Sort of answering my own question:
The MP3 caliper carrier (part # 2B0006085) will more than likely fit on a GTS, however the brake caliper bolts are at an angle (compared to the shock mount) and meant for non-floating calipers (rear GTS & front LX). I'm not confident that a 240mm disc with a non-floating caliper is an upgrade over a 220mm disc with a floating caliper.


I don't own an LX, but swapping to the MP3 carrier/disc(and caliper?) would be a way to use a 240mm disc on the front (with a 12" wheel). Stoppies anyone?
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Sun Aug 19, 2018 8:55 pm quote
Sorry to bring this thread back from the dead, but I saw that the MP3 now has 258mm wavy rotors. 13" wheels are probably required for clearance.

https://www.cycleworld.com/2019-piaggio-mp3-500-sport-refines-three-wheels



Banned
2:6
Joined: 11 Jan 2007
Posts: 7383
Location: San Francisco
Mon Aug 20, 2018 2:00 am quote
Interesting and nice!

Looks like they may be using the rear GT caliper to space it out by 10mm. Did the same on my LX to go from a 200 to 220 disk.




Here's the current MP3 caliper from the top of this page:


And a close up from the new MP3:

008.jpg
note the gap between the caliper and bracket

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Mon Aug 20, 2018 6:46 am quote
oopsclunkthud wrote:
Looks like they may be using the rear GT caliper to space it out by 10mm.
Good catch! This should be a pretty simple upgrade for older MP3 owners. I also think it means that the 258mm rotors would work on a LX with the MP3 caliper carrier (and 13" wheels).

oopsclunkthud: Did you ever get the correct side MP3 caliper carrier?

Any idea how to determine if one of these 258mm non-floating caliper setups would be better than the stock GTS?
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Mon Aug 20, 2018 8:52 am quote
I wonder how far off this bracket would be: https://www.sip-scootershop.com/en/products/adaptor+malossi+for+oversize_m189800

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Fri Nov 16, 2018 7:20 pm quote
Here's a comparison of different caliper carriers. The MP3 caliper is definitely spaced further out from the axle.

Left to right: GTS ESS, LX, MP3

IMG_20181116_174333.jpg

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Sat Dec 22, 2018 6:46 am quote
SIP now offers a radial adapter & caliper kit for up to a 250mm disc (or 260mm?). The caliper is 4 piston @ 24mm each. https://www.sip-scootershop.com/en/products/brake+kit+sip+radial+front+_mvbrk002




There's even a kit for the rear: https://www.sip-scootershop.com/en/products/brake+kit+sip+radial+rear+_mvbrk004

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Thu Dec 27, 2018 2:28 pm quote
SIP also now sells a complete caliper carrier conversion.

https://vespaforum.de/viewtopic.php?f=17&t=48005&sid=dd466792a3974a60dbd60f8777834ecf

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Mon Feb 04, 2019 10:09 pm quote
I can confirm that the Aprilia SR-Max 300/Gilera Nexus 300 rear caliper does NOT fit with a 13" wheel. The SR-Max/Nexus both had 240mm rear disc, and the same rear caliper as the GTS front caliper (with an adapter bracket 649162)

IMG_20190204_185255.jpg

Banned
2:6
Joined: 11 Jan 2007
Posts: 7383
Location: San Francisco
Mon Feb 04, 2019 11:15 pm quote
funny, I've been trying to see if I can go to a smaller disk on the rear, like the 200mm from the LX front.
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Tue Feb 05, 2019 2:29 pm quote
oopsclunkthud wrote:
funny, I've been trying to see if I can go to a smaller disk on the rear, like the 200mm from the LX front.
Yeah, there's no OEM small 5-hole rear hub that I know of either. Re-drilling should be possible though.

Just out of curiosity, do you want a smaller rear brake so that you can run a smaller wheel? This might be useful for Scomaldi type swaps.
Banned
2:6
Joined: 11 Jan 2007
Posts: 7383
Location: San Francisco
Tue Feb 05, 2019 4:41 pm quote
wanted to do a smaller disk for less weight and don't really need more stopping force in the rear anyhow.

I think the hot setup for a scomaldi would be to base it on the 200 and use the lx gear case. gets the 10in wheel and a shorter wheelbase
Member
Vespa T5 Mk.1, GTS218ie
Joined: 04 Aug 2011
Posts: 40
Location: UK
Thu Jun 06, 2019 5:43 am quote
Hello All,

There is a very simple brake update for the GTS, if running 13" wheels, which cost about 170 (190/$215) depending on taxes, etc.

This will give you a 250mm front disc, standard caliper and use sintered pads.

not full Brembo, but cost effective for servicing and not overkill.

Parts have been available for a while:

BRAKING adapter bracket - POW44

MALOSSI (Galfer) brake disc - 6217150

The parts were designed by different suppliers to put bigger brakes on the Gilera Runner earlier performance 50, 125/180 models, but will fit the GTS.

Based on Oops previous calculations the increased disc diameter, combined with better pads and the LX master cylinder may give a real OEM+ brake upgrade, even with a 240mm disc.

I have the bracket and a machines late Piaggio MP3 front disc (258mm machines to 250mm) for the OEM+ look and I'm awaiting a quote from a reputable brake system manufacturer for some 250mm discs, other than the Malossi ones.

Additionally, I'm looking at getting a similar bracket CNC'd for a 240mm disc on the GTS for general fitment on 12 or 13" wheels.

In theory, the proposed bracket would allow the use of the normal 240mm MP3 disc on the GTS front, but also allow the Late 300-500 MP3 258mm disc to be used on the Gilera Runner ST models (which currently runs a 240mm disc.

Floating caliper bracket 1.JPG

Machines disc 258-250mm.JPG

Machines disc 250 compare to 220mm.JPG

Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 199
Location: California
Banned
2:6
Joined: 11 Jan 2007
Posts: 7383
Location: San Francisco
Mon Jun 10, 2019 10:58 am quote
That open window in the bracket is a bad idea as most the force is in shear.
Member
Vespa T5 Mk.1, GTS218ie
Joined: 04 Aug 2011
Posts: 40
Location: UK
Mon Jun 10, 2019 11:42 pm quote
The bracket is quite heavy duty and machined not pressed.

Floating caliper bracket 1.JPG

Floating caliper bracket 2.JPG

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