My Langster has developed a bit of a creak, which I think it coming from the bottom bracket or the cranks. I cleaned the chain and chainring which alleviated some of the grinding sounds but there's still a creak/click when I put pressure on the pedals. I've checked the crank arm bolts and I've also tightened the chainrings as that was the cause of similar symptoms on my other fixed gear. Any ideas what else I could try? I think it might be an issue of tweaking the chain tension?