UH1-55 is a direct replacement to the stock hub that comes with all three models of the Simucube 2 family of direct drive base systems,
It adds 55mm extra length to the stock hub and with smaller diameter is the perfect add-on in order to extend the motor shaft and give enough room and clearence for you center monitor in order to be as low as posible and to bring it closer to the servo axle.
At the same time it is compatible both with the stock Simucube 2 quick release and also with any 70 PCD quick release on the market,
Both the stock QR and the 70 PCD holes are threaded M5 so no need for ugly nuts.
The UH1-55 is also compatible with out ProXT modular extensions for those that need more than 55mm extra length.
See this great video from Greg at GTGreg on how to install the UH1-55.
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Highly recommend this product ! beautiful finish combined with precision engineering Winning !!!