Drive transmission group to a steer wheel of a vehicle

A drive transmission group (30) to a steer wheel (23) of a vehicle (10) which comprises:

• at least a drive chain ring (31) associable to actuating means (32) in rotation able to impart a rotary motion to the chain ring (31),
• at least a driven chain ring (33) solidly associated in rotation coaxially to the steer wheel (23),
• at least a first intermediate chain ring (34) and a second intermediate chain ring (36) connected respectively to the drive chain ring (31) and to the driven chain ring (33) by means of respective flexible organs (35, 36),
• a universal joint (50) comprising a spider (51) on a first arm (511) of which the first intermediate chain ring (34) is associated, rotatably with respect to an axis of the first arm (511), and on a second arm (512) of which the second intermediate chain ring (36) is associated, rotatably with respect to an axis of the second arm,
• wherein the first intermediate chain ring (34) is concentric to the spider (51), and
• wherein revolving organs (342) are interposed between the first arm (511) and the first intermediate chain ring (43).