You get 8 machined wheel spacers measuring 4.6 mm in thickness that allow you to convert your Marwe 610's to hold our 105 mm wheels (610 spacers aren't wide enough for our hubs - click on picture above to see comparison photos showing our spacers and wheels fitted on Marwe 610's). Doing the conversion is super easy. You just need two 10 mm wrenches to slide out your axle, then put one of these on each side of the wheel in-between the forks, put the axle back through and you're done, and saved a ton of money! You'll be happy with the longevity of our rubber as well!