These cogs let you interface our popular GM2/3/8/9 series gear motors with the very cool GMT tread links. They've been precision molded to mate with the gear motor's double-flat output shafts. They're so precise and snug, you might not even need to use the included mounting screw to lock the cogs on!

The GMTC Cog measures 38mm diameter x 15mm wide, and is made of the same long-life ABS plastic the tread links use.

Note: The cogs have an extremely tight fit on the GM8 & GM9. You may find filing the gearmotor output shaft down a wee bit a huge help to mounting the cogs.

The GMTC Cog measures 38mm diameter x 15mm wide.

Sizing Charts

Women

Size XS S S M M L
EU 32 34 36 38 40 42
UK 4 6 8 10 12 14
US 0 2 4 6 8 10
Bust 79.5cm / 31" 82cm / 32" 84.5cm / 33" 89.5cm / 35" 94.5cm / 37" 99.5cm / 39"
Waist 61.5cm / 24" 64cm / 25" 66.5cm / 26" 71.5cm / 28" 76.5cm / 30" 81.5cm / 32"
Hip 86.5cm / 34" 89cm / 35" 91.5cm / 36" 96.5cm / 38" 101.5cm / 40" 106.5cm / 42"

Men

Size XS S M L XL XXL
UK/US 34 36 38 40 42 44
Neck 37cm / 14.5" 38cm /15" 39.5cm / 15.5" 41cm / 16" 42cm / 16.5" 43cm / 17"
Chest 86.5cm / 34" 91.5cm / 36" 96.5cm / 38" 101.5cm / 40" 106.5cm / 42" 111.5cm / 44"
Waist 71.5cm / 28" 76.5cm / 30" 81.5cm / 32" 86.5cm / 34" 91.5cm / 36" 96.5cm / 38"
Seat 90cm / 35.4" 95cm / 37.4" 100cm / 39.4" 105cm / 41.3" 110cm / 43.3" 115cm / 45.3"