The truvativ aluminium ssdh chainring truvativ 32 teeth single speed downhill bike chainring made of aluminium genuine and original truvativ replacement part ideal for mountain bike 4 bolt 104 mm bolt centre diameter bcd compatible with 8 and 9 speed chain available in blast black colour 3 mm chainring thickness truvativ aluminium ssdh chainring features 4 bolt 32 teeth chainring made of aluminium ideal for mountain bike 104 mm bolt centre diameter bcd available in