Gearing Down a 1VJ Tenere
Reigniting an old thread - actually there is loads on here about it already, but here goes!
I've been running my old 1VJ Tenere on the standard 15/40 sprockets and 18" rear for a number of years. Pretty good for riding on tarmac, gravel tracks and pistes, but a tad over-geared, particularly for more challenging terrain: sometimes the engine labours in top, there is not enough engine braking, and I find myself slipping the clutch more than I would like. This year I'm planning on doing a lot more green laning and off-road, so I want to gear it down.
The useful tables at JT sprockets JT Sprockets: Catalogue
show a standard 1VJ runs at 2.67:1 compared to the 3AJ at 3.00:1 - so the 3AJ seems to be lower geared as standard, though I think I read somewhere that this is something to do with altered internal ratios in the primary drive to help with gearbox wear, but I'm not sure.
Advice on this and other threads points to going down to something more like 3.36:1, for decent off road control. This would mean a 14/47 combo, both available from JT. Steering away from a 13T front as suggested above makes good sense.
1. As it is considerably lower than standard, is 14/47 going to be too low for the road. I don't do motorways, but still want to ride at 100km/h sometimes. I guess I could have a 15T sprocket on standby to whip back on for long road trips.
2. Any idea how many chain links I need for what is an overall increase of 6 teeth (I know there is some geometry to do in there, but it's early in the morning!) I could buy just the new sprockets and lay the old chain round to work this out, but I'm sure someone has been there before!