Middrive metal corrosion compatibility

oldguy

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Apr 28, 2020
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Is there any risk of corrosion with mounting a steel mid drive kit - BBSHD to the bottom bracket of an aluminum bike frame?
 

middriver

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Sep 17, 2018
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Galvanic corrosion can occur when steel is mounted against aluminum. However many parts on your bike are steel like the hubs, nuts, bolts and bearings.

I suppose while there is some risk of corrosion with the kit but after many years of use with my mid drive kit, I see no problems at all. The benefit of the aluminum bike frame is that it wont rust.
 

RichardM

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Jul 8, 2018
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This is a good point, when aluminum corrodes it expands and that will lock the kit on the thread making it impossible to remove. I would try using some grease when fitting the kit. Grease will help keep water and air out and create a separation between the two different metals.
 
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