Am I fast enough for a 100mile Sportive?

How often do you ride, and how much climbing is involved in those rides where you're averaging 17-18mph? I take that's your on-road speed?

spat out the back? i doubt it, unless you're hoping to stay with the lead riders all the way round. that pace will be a bit hot but if you can clock up 50 miles in three hours you won't be last round. i'd concentrate on getting some longer rides in, doesn't matter what pace but you need to get your body used to the longer rides and it'll help you find your pace for 100.

you're fast enough, but you may not have the endurance to nail it at that speed the whole way. How long do you have until the event?

Boshing in a couple of 80milers between now and then will probably see your shorter distance av. speed increase too.

Just do it...put in some miles and hills before then and go for it. What's the worst that can happen? You'll arrive back last, at least next time you can better your time!

I'm doing the Dragon Ride on Sunday and pretty much know that after 80 miles I'm going to be riding with one eye looking over my shoulder for the broom wagon!

If you can ride 50 miles, you can ride 100. But you need to make sure that you can save your legs. I've ridden some seriously steep hills in that area, and the 160 km sportif has 3000 metres of climbing, so I'd want at least a 34/28 gear available.

You'll need to stay fuelled too, but I'm sure you'll get round.

Event looks great.

As an update, I did the 2 moors 100 miler on the 19th July. The weather was pretty awful but funnily enough it was quite good fun. There were a lot of hills but some really nice bits too. If you do it next year don't be fooled into thinking the hills around Dartmoor are any less challenging than the slopes of Exmoor. Especially with 65 miles already in your legs. There was a shorter 100Km route too. Next year there also may be another even shorter route available for novices (like me)

You would not have come last though this year. I took 9 and a half houres on an old 10 speed racing bike with shifters on the frame and I still wasn't the last in.

I Urge anyone reading this to enter this sportif next year.

I decided not to do it in the end as I had a 24-hour mtb race the following weekend and Exmoor explorer yesterday. I thought 3 big events in 3 weekends was a bit silly. I'm definitely keen to start getting some road events in though.