How fast can I run a 5k off of only cycling training?

21 minutes.

17:30

Jon Orange knows Froome can't break 20.

Lance Armstrong Doped 7x TDF Champion

3:00 marathon - 5K equivalent 18:30

2:47 marathon - 5k equivalent 17:16 after a year of training for the marathon.

so you do the math wrote:

Jon Orange knows Froome can't break 20.

Think I'll get a contract from Sky if I run sub 17? Would be much better than Froome at running up Ventoux.

A high school teammate of mine was a cyclist 9 1/2 months a year, then trained for cross-country the remaining 2 1/2 months. He got himself down to sub-16 high school 5000m cross-country. I do not recommend my former teammate's method of training. He could have raced faster if he ran more.

To be clear, I'm not doing the cycling to train for running, just happen to be a cyclist that used to run. I'm doing a 5k this weekend and wondered how fast y'all think I can run it.

What sort of XC? Around a car park? Playing fields? Flat golf course? Undulating golf course? Hills? Tree roots? Mud? How much rain has fallen in the last 7 days? Clay/chalk/ sandy soil? Are you running in spikes? What length? What is the wind speed and direction? Have you seen a measurement certificate proving the course is exactly 5km? Are you good on hills or flat? Do you know the course well? Will you warmup an entire lap of the course before the race to check the latest status? Maybe there is a new ditch, or they filled in the old one, or a tree got knocked down in the recent stormy weather. Will any of the spectators have an annoying yappy little dog that isn't on a lead that darts straight into the pack and bites you in the ankle?

I'm a cyclist who runs every now and then for a bit of fun. Just upgraded to cat 2, 6k miles this year. I'd guess from past off-season transitions I could do 19:30-20 for a 5k right now. Being a past runner, maybe you'd go a bit lower. Maybe 19:30? Curious how it turns out.

*19, not 19:30 for my guess

I Chose D2 wrote:

To be clear, I'm not doing the cycling to train for running, just happen to be a cyclist that used to run. I'm doing a 5k this weekend and wondered how fast y'all think I can run it.

Depends what your best is.

slower but not that much wrote:

I Chose D2 wrote:

To be clear, I'm not doing the cycling to train for running, just happen to be a cyclist that used to run. I'm doing a 5k this weekend and wondered how fast y'all think I can run it.

Depends what your best is.

Track PR is in the high 14s 5+ years ago. Ran low 15s on the road 4 years ago, but since then have not done much running at all and fully committed to cycling.

XC expert wrote:

What sort of XC? Around a car park? Playing fields? Flat golf course? Undulating golf course? Hills? Tree roots? Mud? How much rain has fallen in the last 7 days? Clay/chalk/ sandy soil? Are you running in spikes? What length? What is the wind speed and direction? Have you seen a measurement certificate proving the course is exactly 5km? Are you good on hills or flat? Do you know the course well? Will you warmup an entire lap of the course before the race to check the latest status? Maybe there is a new ditch, or they filled in the old one, or a tree got knocked down in the recent stormy weather. Will any of the spectators have an annoying yappy little dog that isn't on a lead that darts straight into the pack and bites you in the ankle?

Dedicated running course that has smooth footing with a few hills. No recent rain, but it is in the forecast. I know the course very well; it is accurately measured. Dogs are prohibited.

I Chose D2 wrote:

slower but not that much wrote:

Depends what your best is.

Track PR is in the high 14s 5+ years ago. Ran low 15s on the road 4 years ago, but since then have not done much running at all and fully committed to cycling.

17:15

This is stupid and totally depends on what level of runner you are. If you are a food runner who only cycles you could probably go sub16, maybe even sub15. If you are a great endurance cyclist with only average running ability, maybe 19-20 minutes. Bad endurance or bad runner probably above 20 minutes.

*good runner, not food runner

I Chose D2 wrote:

Track PR is in the high 14s 5+ years ago. Ran low 15s on the road 4 years ago, but since then have not done much running at all and fully committed to cycling.

I should read until the end before I comment. My comment is still valid though. I think you should easily be able to go sub16 still. The 5k is an endurance event and you should have enough endurance from your cycling. You should also have some feeling for running left so you shouldn't have lost all too much.

My guess is 15:42.

Næh wrote:

This is stupid and totally depends on what level of runner you are. If you are a food runner who only cycles you could probably go sub16, maybe even sub15. If you are a great endurance cyclist with only average running ability, maybe 19-20 minutes. Bad endurance or bad runner probably above 20 minutes.

My bad, didn't give enough info in the OP, unfortunately only the brojos have the ability to go back and edit posts. As far as my abilities, my running PRs are listed a few posts above, and as a cyclist I've recently done 5.4 w/kg for 20 minutes.

Also, I wish that wasn't a typo because being a food runner sounds pretty fun.

and? Got a time for us?