Trek Domane+ SLR (with TQ HPR50) Tuning Solutions

Domane SLR models don’t have a lot of space for fitting the PLANET3, but it is still possible to do so. We advise you to contact us first before ordering. 

PLANET3 is a planetary gear set which reduces the rotation speed of the magnet used by the wheel speed sensor three times. For every three full rotations of the rear wheel, the magnet completes just one full rotation – effectively making the bike think it’s doing 1/3 the speed it is actually doing, thus increasing the pedal assist speed limit by a factor of 3. For the Specialized models sold on EU/UK market this translates into a speed limit increase from 25 to 75 km/h (15.5 to 47 mph), while the US and Canada models limit is raised from 20 to 60 mph.

For TQ HPR50 e-bikes a dual planet configuration is mandatory and the device will ship as such. Dual planets halve the ratio of the device to ~1,513 so that the speed in low gears is kept higher and closer to “real”, but at the same time the assistance speed limit is lowered to 1,513x normal. This is usually ~38 km/h/23,5 mph for EU specification bikes and most users find it plenty. However, if you don’t really climb very steep stuff or muddy/loose conditions where you’d be likely to have some wheel spin, and you stick to tarmac or fire roads for your climbing in a gear higher than 4th; then you could be fine with a single planet and a higher speed limit of ~76 km/h (especially on the road). You’re welcome to test each configuration for yourself and stick with what works for you.

However, be careful to remove the external position checking magnets after verifying that the internal ones are at 180° “exactly“.