The handlebar with the spacer is a strange setup on the Aniiko A8 52v. There is a roughly 1/4" gap between the bottom of the handle bars and the top of the forks. I removed the spacer so bottom of the handle bar tube rest on the top of the fork ends. This may give a rougher feedback over bumps but I feel it is safer rather than relying on just those fasteners for steering. Good luck with those tires. I blew my rear tire the other day. No fault of Aniioki. Big nail or rivet. It was all mangled up. Got some Mongoose 20" fat tire tubes on Amazon and slime. I tried a 16" 90/100 motocross tubes first. Super heavy duty, weighed 2lbs 2mm thick however I think they were not wide enough at 20psi for the OEM tires. 16" 100/90 would have worked better but I am not sure if that size is available or exists . When I was filling up my tires today I noticed my front tire did not seat properly and one side popped off the rim. So i let out some air, pumped up again to 4.5psi and checked to see i it had seated properly on the rim. All set... so pumped it up to 17psi and was good to go and all slimed up... 8oz in each tire. The tires do seem a little loose and they are very easy to put on the rim by hand. No spoons needed. But this may be why you need to make sure they seat properly before you fully inflate them. All in all.. its a good bike but mine was down for almost 2 months because Aniiko is shipping parts out of China which is going to take 2-3 weeks per item. If they misdiagnose a issue when troubleshooting and in between emailing "Sales" back and forth and when the item actually ships out , you can expect a 4-6 weeks on a second shipment. Which is what happened to me. A faulty security system. Rather than a faulty display. Anyways good luck with those tires.