I have not always had speedometers and GPS, especially in my younger and competitive times. I have seen 35 MPH but I could question that accuracy being it was an early Cateye and what if I did not have it exactly dialed in. I have done 40K in one hour during my serious triathlon years. My cruising speed are anywhere from my 12.6 avg. on a gravel ride today on a MB4 MTB to maybe 18 MPH on my road bikes like my souped up GT or Guerc SLX. But I am heading to 66 years on this planet also. There you go. A few weeks ago I ran the GT up to 26 MPH, I may have had a breeze, did not do a two-way average as I was just having fun doing a sprint and not dying as a result, always a good thing.