Single Speed Creaks?

• Check for a loose pedal
• Put anti-seized the QR
• Swap out to a steel faced QR like a Shimano XT which have a much higher clamping force with a harder interface. This is especially good if your drop outs are the harder titanium alloy
• Remove and clean the seat collar then grease/anti-seize
• Remove the pedals and apply grease
• Check for a seat post for a shim/insert
• Headset can creak
• Check the bottom headset cup, a little grease there and re-torque the headset
• The crown race can also creak against the fork
• Saddle rails/clamp interface
• Put Teflon tape on the EBB
• Check the handlebar to the stem interface and stem to steerer tube interface
• Check and clean if the frame has a removable derailleur hanger