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I dont have any useful information on the gearing, since its a "smallblock", I have used the 7:33 gearing in a "tonti" based tug, instead of the 8:33, with excellent results. what are your plans for trail reduction?Beautiful looking rig, by the way! Rick D.
Brstar, I’m sure you know (and maybe we talked before about it, and you’re influenced by it)— the rare NTX Baja incorporated a big block final drive and swingarm. I haven’t found info on what all they had to do with the installation, but it’s certainly something that would be on my radar as well for my rig.
The earlier small blocs certainly varied the drive ratio's by changing the primary drive ratio's in the gearbox and there are plenty of variations there.With the newer box's there are likely to be fewer options .As far as I've seen all the rear drive ratio's are the same ,certainly until the newer V 7 series anyway.Not even sure whether an older drive box or gearbox would swap over but probably needs a lot of modifications.The only way to check the ratio's is to do some research and you would most likely find that info here with a bit of digging https://www.guzzitek.org/f/parts_list_f.htm
Looks like rear wheel change is best bet. Rear drive is different from earlier small block as there are 2 ujoints on driveshaft not the sleeve & ball type shaft. There are no primary changes I know of for the 6 speed gear box.Front forks are easier to get a Earles fork for sidecar use. You could also make your own triple trees for forks to change trail.A member here Dirk has a sidecar on smallblock but not a V9.Good Luck with your project.
Brstar, I’m sure you know (and maybe we talked before about it, and you’re influenced by it)— the rare NTX Baja incorporated a big block final drive and swingarm. I haven’t found info on what all they had to do with the installation, but it’s certainly something that would be on my radar as well for my rig.That said, I hopped over to the awesome Guzzitek.org and took screenshots of the transmission ratios from many of the small blocks over the years. Including them here if any of it might help (I know you specifically asked about big block ratios, but maybe…).Gear ratios are still a little Greek to me as I’ve yet to get a full understanding of gear ratios (like electronic circuitry, it makes sense when explained, but then I almost immediately forget). V85TT: V9:V7 850 E5: V7 Classic: Breva 750:V35III / V75: V35 / V50: NEVADA 350 & 750 / 750 SP / Targa 750 / NTX 750: V35 / V50 III: V35 Imola / V50 Monza: V35C / V50C: V65 / V65 SP:V35TT / V65TT:
The conversion on the 650 TT Baja's is basically a modification to the swinging arm and diff off a big bloc .The UJ spline on the sb gearbox(from the Monza onwards) and that on the bb uj is the same so no issues there. Info and pictures here https://www.desertpistons.com/guzzi-v65-ttr-tutto-terreno-racing/
Oh yeah....something like that needs to be done by a very competent person !Frankly , staying with smaller wheels is the easiest way to go for doing gearing changes on a shaft driven bike for sidecar use.[/quote.Can't say you are wrong about smaller wheels and it being something for a competent person.But I'm aiming for something better. Or at least I have picture in my head that I will do my best to achieve. If I ran rear V9 rims all around they are wide enough to take a 165/45/16 car tire.A bit of work and money to mount a rear to the front.The down side is ride quality and not the look I want.Like I said it's a bit of a Don Quixote challenge. But recently I put a 1903 Minerva Romania motorcycle back with a friend.This should be easy in comparison. Appreciate the comments though.
