Walkie, why not trade in for this, nobody is going to cut you up in this:
http://www.exarmyvehicles.com/offer/tracked-vehicles/tanks/main-battle-tank-t-72#lightbox-grouped[g]/0/
Russian T-72, max speed 50 km/hour (road) 30 across rougher terrain,
Weapon outfit-main cannon: 125mm (smoothbore), pair of machineguns, 1x7.62mm co-axial mount and 12.7mm heavy autocannon, anti-aircraft capability.
Pretty unfussy about fuel type too, capable of running on petrol, diesel or even paraffin oil.
Or for something smaller, a little faster, by way of a light scout tank with night-ops specialization, including radar, secondary radar for small targets, along with night vision, laser rangefinder along with laser sight countermeasures (detection of active irradiation targeting), max speed 65km/h smooth terrain 45 rough ground, main gun smoothbore with 7.62mm machinegun and antitank rocket launchers
Maybe a self-propelled howitzer, ShKH vz.77 'dana', top speed 80km/h 152mm howitzer, up to 60 round reserve capacity, dependent on ammo type, wheeled rather than tracked, light antiaircraft machinegun (very light, for an AA gun, just 7.62mm, still would do just fine to deal with shitty drivers, and you could use the light AA backup as the perfect tool for dealing with those lycra-clad shitheads who are not just ordinary, decent cyclists but the kind of fuckheads who obsess over their bikes and ride like, well, fuckheads and think they were born to own the roads. Would be the last time THEY do any cutting up.
And with a maximum range (main weapon, if using specialized long-range ammunition, 20km, with a range for the standard ammo of a bit over 4 1/2 km) then anyone who's pissed you off and sped off...well they better be pretty quick off the mark and get lucky every time you get a shot off (and for a damn long time if your packing the long range grenade launcher variant (only 40 round max capacity for the main turret but with a 20km range that ought to give any bastard driver an awful case of the shites:D)