Wheel and cassette issues-need advice!
Need some advice on changing wheels and cassettes. I recently changed my wheels from some standard Shimano wheels, wh500's or something (i.e. the worst model) to some Mavic Krysiums. As well as that I changed my rear cassette from a 12:25 to a 12:27 to help with taking on the big hills in longer events(i had to buy a new chain as well as apparently it wears with the cassette)....Anyway since doing this about a 2 weeks ago I have found that I am consistently slower when out cycling, i.e. I would go along before at around 19-20mph pretty comfortably, and now im grinding out 18mph with my heart rate about 10bpm higher- basically feels like i'm riding with the brakes on (and they're not as I checked!!)....Has anyone experienced this, or knows whats going on? Does it need time to wear in before it gets better, or could it be a problem with the new wheels or maybe the new ratios aren't working (this is what some guy said from the shop where i bought my bike-but surely there would be comparable ratios between the two set ups??)..Any advice would be great as this is really confusing/annoying me!