R1 is slightly lighter than O1 (around 19% lighter for size medium). No big difference in length or dimensions.
Many players seems worried about the weight but despite that we feel very confident about it. During the test period for the past months with around 15 high level players that have used them regularly in training and games, no one have negatively comment or complain about the weight. Its also important to notice that O1 has a lot of movement in both directions to always challenge your balance and force you to work hard at all times. This make them feel more heavy than they actually are. With R1 its the opposite, you can do more of your natural movements without lifting up the skates from the ground than with traditional chassis, making them feel lighter.