24th-Jul-21, 02:13 PM
Good question. HO contrate / crown gears are naturally smaller in diameter (8 to 11mm) and fit a 1.5mm diameter axle (Tomy AFX is 1.55mm).
They are available in 20 to 27 teeth - the standard ratio in most RTR HO cars is 7:25.
Most HO pinions are 4mm in diameter, plastic and have 7 or 8 teeth. For the 1mm shaft, your only choice is 7 teeth (unless Viper produce an 8T - which they might).
For a 1.5mm shaft you can also find 7, 8 and 9 teeth in steel and 8 to 12 in brass. Metal crowns are available.
The widest selection are the Wizzard gears on Lucky Bob's site here. Bob is also a veteran 1/24 scale racer, so worth asking.
They are available in 20 to 27 teeth - the standard ratio in most RTR HO cars is 7:25.
Most HO pinions are 4mm in diameter, plastic and have 7 or 8 teeth. For the 1mm shaft, your only choice is 7 teeth (unless Viper produce an 8T - which they might).
For a 1.5mm shaft you can also find 7, 8 and 9 teeth in steel and 8 to 12 in brass. Metal crowns are available.
The widest selection are the Wizzard gears on Lucky Bob's site here. Bob is also a veteran 1/24 scale racer, so worth asking.
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