Stop Your E-Bike Hub Motor Overheating!

Buy HubSink V2 for Hub motors

$79.00

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Vastly Improved Cooling, Hill Climb & Performance for eBike Hub Motors

Hubsink has proven through years of real world testing and development on thousands of bikes, to stop ebike overheating hub motors, add power handling, cooling, hill climbing and thermal management of hub motors with ~200% better overall thermal dissipation! If your hub motor e-bike is overheating or you want better hill climb or general riding performance, install a set in 10 mins, Fits QS205, MXUS, Leaf, Leaf 1500, 9C, & other standard hubs with a 222mm to 239mm OD as well as Larger versions available for QS273 and TC Crown

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Easy to Fit - Solve Your Overheating Issues!

HubSink comes in six separate pieces. Easy to install in 10 - 15 minutes without removing spokes on almost all wheel sizes down to 17" to stop ebike overheating & fix ebike overheating

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HubSink test videos - Real world testing and performance

Hub motor cutting out on hills, or want to run more power?
Read why ebike hub motors overheat, and how to make your motor handle more than double the power

How to run more power through a hub motor without overheating, and every motor HubSink fits

Before and after: HubSink ebike overheating test on a high powered ebike during a 2km hill climb

Testing the HubSink heat sink prototypes (and winning) the TT1500 race at 20kW

Find the right cooling for your hub motor

QS205 hub motor cooling | MXUS hub motor cooling | Statorade ferrofluid | Installation guide

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FAQ

Q: How much more power can i run?

(Stop ebike e-bike overheating) A: (lots) There are too many variables to make any concrete assumptions on exact power handling in practice but for arguments sake if a MXUS with FF is overheating 15 mins into a ride because it’s producing 2600W of excess heat under throttle and the hub can only shed 1500w, it looks like we can dissipate more than half of that excess to potentially let it be ridden in the exact same manner indefinitely with HubSinks. This needs further testing, it may be because keeping the temp lower earlier improves efficiency.

Q: Will it fit my motor?

A: The Beta version of the HubSink will fit any of the ‘standard’ hubs with a 222mm to 238mm ØD Magnet ring and at least 18mm free space between spoke flanges, MXUS, QS 205, Leaf, Crystalyte, 9C and other common sizes NOTE: QS273 hubsinks are in beta stage and available now, they are working very well and just neem a little adjustment to suite each bike while fitting (see instruction page) These are really helping the massive QS 273 motor shed heat and cool down much faster at high power

Q: Do i have to remove my spokes to fit?

A: We designed the HubSink in 6 pieces so even on a 17” moto rim with 10g spokes, they should be easy to slide in then install.

Q: What if you paint it black?

A: Black anodization will IMPROVE the emissivity factor from approx 0.09 to 0.89, so we did. Standard paint may insulate them but very likely not enough to be a concern unless you are at the limit of their emissivity if you want to change the colour

Q: What if you angle the fins 45° or curve the fins?

A: During testing (both practical with FLIR and wind tunnel) the centrifugal action of the spinning hub pulls the air in from the sides of the fins and as air has weight, as it accelerates it flings the warmed air (and therefore the heat from the motor) out radially, there was no improvement when testing either a 45 degree lateral twist or a curve to the fin, the straight fins has outperformed all other options we have tested.

Q: What if the fins were radial (lengthways) rather than axial?

A: Turbulent flow has a much higher rate of heat transfer than laminar, combined with the centrifugal action of the fins we have found the axial fin design to be the most effective.