Just did it on me: 220 - (67x.64) = 177
Sounds just about right.
I’m 50 and max observed outside is 194.
Resting HR is 37.
Hunt formula is closest at 188…
Age 46.
Max of 205.
Age: 63
Max HR: 193
45
max 15yr ago: 176
8yr ago: 172
now: 167
Last year I hit 194 once. I am turning 40 in March. So that’s about 14 off of the 220 minus age.
Of by 18bpm. For me this formula is a better indication of my threshold HR.
220 - 51 = 169bpm for me - my max in Ramp tests is 179bpm so 10bpm for me… 
My computed max is 194.6 using this formula so it seems pretty much bang on.
220 - age (36) = 184. My maximum is actually 183bpm so the traditional formula is almost 100% accurate for me.
One point though - when I ran I could get a higher max. When I started time trials my max in races was lower. Even in the Ramp test when I started TR I have looked back to Oct 18 and it was 173bpm. I can now do 179bpm in the ramp even though I am 18 months older - but a better cyclist so maybe I am using more/developed more leg muscle and can really exert myself more like when I ran…so maybe it is situation specific! 
25 years old, estimate would be 195 max hr
Actual: 212 bpm max. My threshold heart rate falls in the 185-195 range. Any time I go over 200, I’m in a bad spot.
Well, you are sitting down when you’re on a bike. 
My estimate is 186, my actual is ~210 so it’s off by 24 bpm for me.
24 here estimate would be 196
My max I’ve every seen is 189
Formula overestimated by 7
Maybe - although there is less muscle mass involved and it’s not weight bearing…I’m getting there with my bike HR - but I was a much better runner than I am a cyclist at present (although I stopped running nearly 2 years ago) so maybe I was closer to my performance ceiling when I ran. I suppose I should say 179bpm is the highest I’ve seen and since I’m 51.5 years old I can’t believe there is much more there.
Mine is pretty close.
220 - 49 = 171
My max is right around 167 or so.
30, Recorded at 195. 5BPM higher than predicted.
53, had not seen anything higher than 171 for the past 20 years. Saw 176, then 180 this last week. Don’t know if that was not being as fresh for hard days in the past, or early signs of a heart issue. I will see.
220-43=177
Max recorded in the past two years 178