Avoid at all costs! Do not buy anything from these cowboys! I bought a Shimano FC-TY501 Shimano Tourney 7/8 Speed Chainset from these guys. 5 months later, it fails, threaded, despite being professionally fitted by a mechanic I trust. Tredz are claiming the fault could only have occured by incorrect fitting - really? Even with riding with them for 5 months doing 85-100km per week? Seems like a stretch guys. You've got no chance if something goes wrong. They are a disgrace to the cycling fraternity. Fortunately, both Comsumer Advice Scotland and trading standards are helping us to get justice. Waste of time and money. Customer service is abyssmal, rude and obstructive. Very poor guys - must do better. PS: Just discovered Tredz are owend by Halfords, there's a surpirse, I'll NEVER use them again - and neither should you!