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It is not really about speed, it is about load. Extreme lugging is bad, as well as red-line or above shifts in every gear also.
I would suggest just riding it and not worrying too much about it. The bike will communicate to you when to shift it, and in this way you will become one with the bike. If you are like me, you are going to experiment with all kinds of different techniques anyway. Find what feels best.
Here's the Upshift Gear Speeds Chart (six speed) from the 06' Dyna Manual found on page 94:
I don't really know what speeds I change at on the way up. The sound tells me to. I tried this chart for cruising in town and on the highway and I found that I don't like Sixth gear at 55 mph. It sounds like the rpms are too low even though it is at 2000 +- a few. I now prefer 5th gear for 55 mph. I will use 6th at 60 + mph if it is for an extended period of time cruising. What is hard is 50 mph. It seems 4th is too many rpms and 5th is not enough. I hate cars that drive at varying speeds right around 50 mph. Change to 5th, change to 4th, change to 5th, etc. on and on.
4th gear sounds right for cruising at 45 mph. It is about 2300 to 2400 rpm.
Cruising overall seems to be right when the rpms are around 2400 to 2500.
Of course 70 mph on the interstate is 6th at about 2700 rpm.
All of this is from memory and may be a little off. I usually go by sound but I try to look every once in while just for questions like this.
I ride by sound and feel. If the road is flat, I can hit 6th around 60. If I have hills or rolling roads, I need to stay in 5th longer. The engine does seem to like to rev. I have problems trying to hold 30 in traffic. I have not found a comfortable gear for that yet, so I am still experimenting. That's the fun part of riding a new bike.
My feeling is the Charted shift points are minimums. In traffic I like to ride with slightly elevated RPM's so that if someone moves over on me or I feel that I need to be in a postion other thanthe one I am in I can make it happen instantly and without having to down shift first. After hitting the throttle the time that it takes to realize that you need more torqueand thus need to down shift and the time to actually do the shifting can be critical ifa cage is moving in on you abruptly/without notice. Running 500 or so RPM's higher than minimum revsprobably does little harm to the engine or MPG.Over the yearsthe elevated RPM's has given me the ability to move out of harms way more quickly and with less elevated blood presure. There have been times in my riding historythat I twisted the throttle and found that I was in to high a gearto move me as quickly as I felt I need to move out. I have an 06 BOB and feel that the engine is lugging if I shift to 6th gear prior to 75 MPH.
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