v-brake, shifter...
 

hi

i live in canada, quebec

my bike is a Diamondback Axis (old bike)

i have a deore LX rear derailleur
and a deore XT front derailleur

my shifter and my cassette have 7 speed

my shifter / brake lever are shimano stx
i think my shifter and brake lever is linked...
i have cantilever brake

i would like to change my cantilever brake for v-brake...
i surely need to change my shifter ?

are there any brake lever/shifter (7 speed) who support v-brake?

on ebay i only find shifter over 7 speed...

i would like to buy v-brake and shifter/ brake lever who is done for 7 speed... i'm not able to find a store on the web who sale that

can i buy shifter who support 8 or 9 speed and use it on my bike? (some speed will not be used)
does any rear derailleur is able to set to 8,9 speed?

thanks

7 speed shirters are rare.. i can't find them on any second-hand websites..

As for shifters, check out this link for some 7 speed shifters that will probably work with your 7 speed setup. The brake levers on the Altus 7 speed set are designed for V-brakes. I'd also go to Sheldon Brown's Website for some advice on conversion to v-brake (I'm sure he's got something there).

if i change my rear hub and cassette to 8 or 9 speed, that will be ok?

maybe i will buy another complete wheel...

if i buy a new wheel, i need to change my shifter...
i surely need to change my brake lever to support v-brake too
does i need to change my rear derailleur to support 8 or 9 speed?

it's a deore lx...