If you can ride 60-80 miles you can ride 100. Try and get some rides of 60 miles plus in leading up to the ride and you’ll be fine. Make sure you eat and drink enough and head into it with a positive attitude.

Is that 60-80 miles offroad on the HT?

If so the sportive will be simples.

If you are on the HT then the road bikes will gap your on the downhills, but you will probably pull them back on the uphills, judging by the cairngorm classic I did a couple of years ago.

I did 100 miles today in 5:30. I have been running mostly for the last 20 weeks. After 70 miles it really hurt, I haven’t ridden much over 50 since last Autumn, let alone 60-80 on an mtb. You’ll be totally fine!

I did LeJog last year. 10 days of 100 miles. Two of the group were older ladies (and by that I mean even older than me) on 26″, fat-tyred hybrid shoppers. The bikes weighed a ton and had that upright seating position. For sure they were more tired at the end of each day than most of us, and they were a bit slow – needing encouragement as the day went on. But they still managed it.

If you are doing 70-80 miles on a MTB – and that’s real, rough mountain biking – then a 100 mile ride on a road will be a relative doddle.

Alternatively, just fit some slicks on the MTB if that’s what you are used to riding.

I done the Wythenshaw 100 last weekend on a road bike and managed to get round ok. I’d not trained for it to be honest so was a bit aprehensive. The most i’d ridden on a road bike was about 35 miles and maybe 30 on a MTB in a day so it sounds to me as if you’ll have no bother. I struggled at about 75 miles but plodded on and got round in total at 6:25hrs. Happy to finish!