Anyone got any idea if there's a formula to calculate predicted time for say a 10k with or without lots of ascent Not sure if that sentence makes sense but...I did a 10k along a hilly track today, 220m of climbing in first 5k. Took me 49 minutes. It felt hard going. I haven't done a road 10k in about 10 years and was about 42ins for a flattish course. I'd there a way to predict my 10k time on a flat course from this? Or do I just need to go and do one. Neil