UTC

Molto Verboso
Joined: UTC
Posts: 1044
 
Molto Verboso
Joined: UTC
Posts: 1044
UTC 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!!
⬆️    About 8 years elapsed    ⬇️
UTC

Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
 
Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
UTC 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.
UTC

Ossessionato
GT200 & GTS250 & NC750X & Royal Enfield Pegasus
Joined: UTC
Posts: 2143
Location: London
 
Ossessionato
GT200 & GTS250 & NC750X & Royal Enfield Pegasus
Joined: UTC
Posts: 2143
Location: London
UTC 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 The problem with restarting two 10 year old threads is that the information in them is probably all out of date.
UTC

Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
 
Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
UTC 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.
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@oopsclunkthud avatar
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Banned
3:5
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Posts: 8921
Location: San Francisco
 
Banned
@oopsclunkthud avatar
3:5
Joined: UTC
Posts: 8921
Location: San Francisco
UTC 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
UTC

Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
 
Enthusiast
Vespa T5 Mk.1 - 172, GTS RS300
Joined: UTC
Posts: 51
Location: UK
UTC 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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