Vintage Vespa Forum

Gearbox upgrades for 8 inch wheels!

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dudley1972 Avatar
dudley1972 Jason C
Gillingham, Kent, UK   GBR
1962 Vespa VBB Standard 150 "Maria"
1963 Lambretta Li 150 Series 2 "Rallymaster"
Hello all,
I have just rebuilt a vespa VBB (Sportique) 1963 on 8 inch wheels, have rebuilt the engine using Pinasco 177, beefed up 3-plate clutch, 24 spaco carb, Mazzucelli crank and Sip road 2. I have managed to get 68mph out of it using a digital speedo from SIP. I was thinking of changing the gearbox to a 23/64 tooth combination and was wonderig if anybody here has had any experience with these gearboxes, if so could you please let me know what gearbox you fitted and how you got on with it as I'm looking to give this a go myself, should increase the ratios and stop the engine screaming at 60 mph, plus give better gas consumption.
Many thanks

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