NEW GTRO 3-speed internal chain-set gearbox

previously EFNEO, new, updated version, produced in UK

black as standard, custom colours on request

perfect for trekking, hybrid, urban, single speed, city and folding bikes, as well as for off-road non-competition bikes, e-bikes and trikes

can shift to first gear from a standstill, like in a car, or under load

immediate gear change, quicker and easier than a front derailleur

no chain-skewing and chain-dropping, even when paired with a rear derailleur

reduced maintenance, no lubrication necessary

heavily tested (on-road, off-road, laboratory and winter tests)

1:1 / 1:1.43: / 1:1.79 ratios

direct-drive 1st gear, second and third are incremental

5 bolt spider for 130bcd chainrings

not suitable for competition MTB, downhill or dirt applications

the easiest front gearbox to install

no frame modifications necessary

compatible with most bicycle frames, using English threaded BSA bottom bracket shell

shell diameter cannot exceed 45,6 mm

trigger or twist-grip shifter

compatible with any rear transmission  (derailleur, geared hub, single speed hub, rear motor) except fixed wheel. For internal geared hub, please check manufacturer’s specs for the smallest front chainring allowed

also available for Brompton or other folding bikes

get in touch for more details or to discuss specific requirements