The e-bike adapter kit increases the width of the Mac Ride stirrups to allow the seat to fit on a greater number of e-bikes, or wider modern-day bicycle frames.
The width of a Mac Ride seat's stirrups is 73mm. To allow for wiggle room and to ensure Mac Ride's stirrups don't touch your frame, we recommend a max top and down tube width of 68mm or less. This fits almost all cruisers and mountain bikes. If your frame is 68mm or wider, then you need an e-bike adapter. There are two sizes to choose from: