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I've not installed this yet but have done a dry build and everything fits with a few small modifications. This will work on both a GT/GTS and an LX as the speedo gearing is the same in both. I've done this work primarily for my LX but as it's a long way from completion I'll be setting it up on my GT first.

It should provide a 40% increase in braking deceleration on the GT and a 12% increase over the already great stock LX brakes.

Parts needed:
LX Caliper mount (5602865)
GT/GTS front hub (598654)
GT/GTS front disk (564573)
GT/GTS rear caliper (CM074101)
There is a groove on the caliper mount to clear the screws holding the disk. This groove must be made 5mm wider to clear the GT disk.
There is a groove on the caliper mount to clear the screws holding the disk. This groove must be made 5mm wider to clear the GT disk.
showing the wider groove clears the screws.
showing the wider groove clears the screws.
The GT/GTS rear caliper is almost the same as the LX front. The one key difference is that the mount holes are set 10mm further from the center of the piston. This positions the caliper 10mm further from the hub center making room for the 220mm disk
The GT/GTS rear caliper is almost the same as the LX front. The one key difference is that the mount holes are set 10mm further from the center of the piston. This positions the caliper 10mm further from the hub center making room for the 220mm disk
The caliper has about 5mm clearance to the LX rim.
The caliper has about 5mm clearance to the LX rim.
⚠️ Last edited by oopsclunkthud on UTC; edited 1 time
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Veni, Vidi, Posti
2007 Vespa LX 190, 2011 LXV150ie
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Veni, Vidi, Posti
@silver_streak avatar
2007 Vespa LX 190, 2011 LXV150ie
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Nice out-of-the-box thinking, Patrick!
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Vespa GTS 300 - LX 125 and many more NotSoModern
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Vespa GTS 300 - LX 125 and many more NotSoModern
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Just to be sure...

on a GTS you only need a LX caliper mount and GTS rear caliper mounted on the front fork of the GTS, right ?
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MOD-Vesp-FR wrote:
Just to be sure...

on a GTS you only need a LX caliper mount and GTS rear caliper mounted on the front fork of the GTS, right ?
correct, I've added part numbers above. due to some other small differences in the caliper mount where the shock attaches it looks like it's going to lower the front by about 2-3mm as well. I'll be installing it this next weekend and will add to the report.
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Vespa GTS 300 - LX 125 and many more NotSoModern
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Thanks.

Looks like a cheap conversion, only 109,60EUR of parts needed for a GTS.

Keep us informed on the upgrading and feeling.
Would be a nice alternative to the Brembo option from Jettin.
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Got the install done and did a loop around the block. I think I've still got a bit of air in the system as it's a bit mushy. Also the pads are still bedding in.

First impressions are not amazing, we'll see after the air and bedding in is sorted.
Forum member supplied image with no explanatory text
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Well, it's not a good conversion on the GT. In fact it's a huge step backward on the GT. On the LX is should be quite nice but that report will have to wait till I get my LX done.
⬆️    About 2 years elapsed    ⬇️
@mod-vesp-fr avatar
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Hooked
Vespa GTS 300 - LX 125 and many more NotSoModern
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Vespa GTS 300 - LX 125 and many more NotSoModern
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UTC quote
oopsclunkthud wrote:
Well, it's not a good conversion on the GT. In fact it's a huge step backward on the GT. On the LX is should be quite nice but that report will have to wait till I get my LX done.
No news on the conversion fitted to the LX ?
⬆️    About 1 month elapsed    ⬇️
UTC

Molto Verboso
'05 Vespa Granturismo
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Molto Verboso
'05 Vespa Granturismo
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What is supposed to be the advantage in the mod?
My two '05 GT200Ls have great brakes. I can't immagine how they could be improved.
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This conversion on the GT (assuming you change the master as well) gives only a 3% increase over the stock GT.

But done on the LX it gives a 40% increase. With any luck I should be able to report results by the end of this weekend.
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