Few upgrades to my fixed/cruiser mod. Took off the downright dangerous fixed gear and replaced with Avid disc. Fitted a Shimano freewheel. Swapped out stock steel cranks for carbon cranks. Swapped out pedals for Nano Evo X. Swapped alu post for carbon. Swapped white seat (bad idea) for black Nukeproof. Even though you sit up on the bike rather than hunched over it, and even though I've swapped out the slicks for mud pluggers it's still blisteringly fast. The tyres are pumped to around 70 PSI, so they are rock hard. I'm just uber paranoid about slick tyres after a bad crash once where me and my bike ended up jammed under a parked car. The only bike that is not in storage. It'll be out there this summer again, just like last. I had a bloody blast on it then, terrorizing the local cycle lanes lol.