LX brakes > GTS brakes, NOT!
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Molto Verboso
Joined: 30 Nov 2007
Posts: 1032

Wed May 04, 2011 11:30 am quote
Have you compared LX and GTS master cylinders for length of travel? And fluid movement??

The brembo conversion on the GTS really needs a bigger master cylinder, I found the lever feel to be dreadful on stock, but much improved on a 16mm brembo... Even more so as it was a radial item, but it would've meant serious mods to the headset plastics!!
Member
Vespa T5 Mk.1, GTS218ie
Joined: 04 Aug 2011
Posts: 48
Location: UK
Thu Jun 06, 2019 2:15 am quote
Hello I know these have been old threads on brake mods and comparisons, but couldn't find the relevent calculation input data, so I could calculate some additional option.

I'd like to know the effect of both a 250mm and a 240mm brake disc on the standard GTS set up and the GTS Oops brake configs.

his would be using everything standard other than the disc diameter and the LX master cylinder on the Oops config.

Thanks.
Ossessionato
GT200 & GTS250 & NC750X & Royal Enfield Pegasus
Joined: 23 Aug 2013
Posts: 2135
Location: London
Thu Jun 06, 2019 7:04 am quote
Wouldn't you of done better simply starting one new thread? The problem with restarting two 10 year old threads is that the information in them is probably all out of date.
Member
Vespa T5 Mk.1, GTS218ie
Joined: 04 Aug 2011
Posts: 48
Location: UK
Mon Jun 10, 2019 1:22 am quote
why reinvent the wheel when all the information is right here ?

plus added to this too, GT/GTS Brake Upgrade

If ya want me to start another thread, I can.
Banned
2:6
Joined: 11 Jan 2007
Posts: 7468
Location: San Francisco
Mon Jun 10, 2019 6:21 am quote
lennymbsc wrote:
Hello I know these have been old threads on brake mods and comparisons, but couldn't find the relevent calculation input data, so I could calculate some additional option.

I'd like to know the effect of both a 250mm and a 240mm brake disc on the standard GTS set up and the GTS Oops brake configs.

his would be using everything standard other than the disc diameter and the LX master cylinder on the Oops config.

Thanks.
between this post and on the other thread you have listed quite a few alternatives.

12 vs 13in wheel
LX vs GTS master
220 vs 240 vs 250 disk.

I'm not sure that the GTS caliper will fit in the 12in rim with a 240 disk, but suspect it will just make it. No way it would fit on a 250 without going to the 13in rim, but the larger wheel reduces the effectiveness of the brakes. I'd need to know what size tire would be used for the 13 to run that calculation.

12in wheel, LX master (11mm), 240mm disk: 147% vs GTS
12in wheel, LX master (11mm), 250mm disk: 154% vs GTS
Member
Vespa T5 Mk.1, GTS218ie
Joined: 04 Aug 2011
Posts: 48
Location: UK
Mon Jun 10, 2019 1:01 pm quote
Hi, I'm sorry for the mixed amount of information.

So I have the Runner ST 13" wheels, which are 3.5" wide (130/60/13-F and 140/60/13-R), giving me a front diameter of 486.2mm compared to the original GT/GTS, 120/70/12, which gave 472.8mm.

I have the Braking bracket and the 250mm disc fitted so what woul that calculate as an improvement, then if I add the LX master cylinder ?

The 240mm idea comes from the MP3 running the 240mm discs and 12" rims as standard, so should be fine, i am enquiring about a CNC bracket as a simple OEM+ upgrade for people.

The new MP3 runs 258mm discs, but the Hengtong sliding caliper is the issue on a GTS.
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