I don't want to hijack this thread re: A23 vs. Hed but I noticed that you have access to studies re: wheel weight's relationship to speed so I hope you can help me with a related question. What would difference in speed be on flat road between A23 and Kinlin xr-270 (also 445g) assuming no variables - i.e. same road and weather conditions, same bike, same tire and tire pressure, same rider physical condition, etc. Thanks.