Upside Down Suspension Forks Mountain bike trails & Mountain bike reviews › Protected: Forums › Mountain Bike Forum › Upside Down Suspension Forks Tweet Add to Flipboard Magazine. Tagged: forks, suspension, x fusion Viewing 0 reply threads Author Posts October 2, 2015 at 13:26 #175641 Aaron Chamberlain ✓ supporter X Fusion has been showing their upside down (USD) Revel fork for a number of years now, but it’s typically been the uber-limited edition gold color that costs around $1,800. They were showing a more attainable, all-black version at Interbike. Pricing is TBD, but I would guess in the $800+ range. Anybody had experience with a USD fork? Good idea? Bad idea? Author Posts Viewing 0 reply threads You must be logged in to reply to this topic.