Description CENTRE HUB HOLE IS 52mm (D in 2nd photo), DIAGONALLY ACROSS MOUNTING HOLES ARE 68mm TO HOLE CENTRES (A to B centres in 2nd photo), 48mm FROM HOLE TO NEXT HOLE CENTRE (A to C in 2nd photo) SPROCKET IS 6mm THICK. TO CALCULATE YOUR CHAIN/SPROCKET PIT IF YOU ARE UNSURE SIMPLY MEASURE THE THICKNESS OF A SPROCKET. 6mm THICK IS 420 PITCH, 7mm THICK IS 428 PITCH. 2ND & 3RD PHOTOS ARE FOR ILLUSTRATION PURPOSES OF DIMENSIONS ONLY PLEASE CHECK MEASUREMENTS PRIOR TO PURCHASE. ORDER BEFORE 12 MIDDAY ON MONDAYS OR AFTER BANK HOLIDAYS, 2PM TUESDAY TO FRIDAY FOR SAME DAY DISPATCH. WE ONLY DISPATCH ORDERS MONDAY TO FRIDAY. If you have any questions, please call us on 01789766777. Phone opening hours 10am-2pm Monday to Friday
