Interesting.
220 - my age(37) = 183
My actual HRmax= 196
So the HUNT formula is dead on
220 - (37x.64)= 196
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.
I never get to maxhr during TTs or ramp tests FWIW. For me it’s generally like a 10min 105+% effort followed by an all out sprint, or 30/30 gonna head or tabata style intervals. You should try different ways to elicit a max response on the bike, it should be achievable to get similar run/bike maxes
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.
