After yesterday`s adventure with my Fat Tyre I thought I would follow the same route on my Batribike Quartz Folder . Before setting off I changed the innertube in the rear tyre . I had been given a slime filled tube as a present and have had nothing but trouble with it . Slime oozing out , valves sticking etc. I set off and after 2 miles there was an enormous bang and the front wheel locked up . The alloy rim had parted where the brake blocks rub and the deformed sliver of alloy had punctured the tube which was at least 50 psi to start with . I had to remove the brake blocks to be able to push it home . Luckily this happened at walking pace , as a bit further on I would have been doing 25 mph downhill . Despite being my 83 rd birthday tomorrow, do I have a third attempt at my 25 mile route ? My crank drive Pro Rider is available as is the Fat Tyre which is holding air after yesterday`s abandoned trip . At one time I preferred simple block brakes but after having both rims on the Quartz split , I think that wearing out discs is preferable . Safe riding everyone !