Yamaha TRX850 Enthusiasts Forum

what are standard size sprockets for the trx?
does anyone reccomend changing the sizes for better all round performance/ridablity
if so what to front and rear?

Hi, Standard size sprockets are F17 R39

I currently have a F16 R39 setup it's a good compromise for the city although I would probably go back to standard if I were doing more H/way riding.

col
im thinking that keeping the gearing std may be a good idea for back home. most roads in the part of the country you are going to are two lane, what you would call b roads and long strights are few and far between. you may get a better top end on the motorway but riding back home is all about georges, ranges and rolling open country. from tauranga to auckland, about 230km there is only about 30k of dual/triple lane. and thats state highway 2

I too have 16/39. Lots of people go to 17/42 Both return similar final gearing if you do the maths.

My bike will still attain an indicated 135mph (aparrently ), obviously it's now revving a bit higher at speed (something like 6000 revs at 100mph). I like it for town use, but I do a lot of motorway too.

There are suggestions that a 16T sprocket could cause more chain wear but I've not had a problem.

I've gone for standard gearing but if the nz roads are nice and twisty would it be better
to go up at the back for a little more acceleration out of the corners?
I've been told some of the road surfaces are a little on the rough side.

Hi,

In the same topic, has anyone tried 16/42, as it is very twisty where I live and I do very little mway k's. Already on 17/42 which is much better than standard for all the uphill hairpins round here and I still get about 250k's before reserve.

Thanks

Paul.

yes i have tried 16/42, it was ok but ran out of steam at about 120 mph ,,it was a lot better around town ,,but it did make it a wheelie machine ,,i also used the std 110 link chain with this setup ,,i have now gone back to 17/42 which i feel is the best compromise

a lesson in road building in nz.

1 cover desired area with lots of gravel and heavly compact.
poor hot tar over desired road surface.
drive truck with losse metal/fineer gravel (approx .5-1cm sq)over the tar spreeding the gravel on to the tar.
leave to bake in the sun.
have one lazy guy sweep the remaining gravel off.
leave large piles of loose metal as hazzard to all road uses.
job done.
theres a bit more to it than that but thats the idea.
the tar melts in the sun and the roads develop ruts and ripples. i have even moved some of the road surface out side my old house with very late breaking and very hard turn in in my primera. but the sun has to be baking
the new roads are alot better than they have been in the past.
but most are fine, but some are well worn.

brockzila wrote:a lesson in road building in nz.

1 cover desired area with lots of gravel and heavly compact.
poor hot tar over desired road surface.
drive truck with losse metal/fineer gravel (approx .5-1cm sq)over the tar spreeding the gravel on to the tar.
leave to bake in the sun.
have one lazy guy sweep the remaining gravel off.
leave large piles of loose metal as hazzard to all road uses.
job done.
theres a bit more to it than that but thats the idea.
the tar melts in the sun and the roads develop ruts and ripples. i have even moved some of the road surface out side my old house with very late breaking and very hard turn in in my primera. but the sun has to be baking
the new roads are alot better than they have been in the past.
but most are fine, but some are well worn.

what the billy buggery has this to do with sprockets

col wrote:I've gone for standard gearing but if the nz roads are nice and twisty would it be better
to go up at the back for a little more acceleration out of the corners?
I've been told some of the road surfaces are a little on the rough side.

col is moving to New Zealand (or as i like to call it home) in a few weeks or so..
our roads are very different than here and i was giving him a bit of inside info as to what to expect.

so there!
naa naa na naa na

im still torn between what gearing to use. i have stock gearing at the moment but was told 16 front and maybe 40/41 rear would make it nice around town. doing this, will the bike lift its wheel on power? i dont want to go nuts but would like to have a little fun too I mainly ride around town, avg speed around 80kmh and some highway but very little. im not after top speed, just a comuter and the odd fang up a twisty road.

any thoughts?

having tried most gearing setups i find 17/42 the best on Trixie

steve speed wrote:having tried most gearing setups i find 17/42 the best on Trixie

wot he said ^^^^

and what is this combination like on hard power/throttle??