GT/GTS Brake Upgrade
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Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 162
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: 162
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: 7357
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: 162
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: 162
Location: California
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 162
Location: California
Hooked
GTS 250
Joined: 26 Apr 2008
Posts: 162
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: 162
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: 7357
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: 162
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: 162
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: 162
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: 162
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: 162
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: 162
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: 7357
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: 162
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: 7357
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
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