Calves hurt - unable to run after cycling

I can run several off-ride miles no problem. I've started doing some adventure racing and always try and run after the MTB stage. However, my calves always tighten up really quickly while running and it hurts so much I have to stop. Last night I even got cramp in one calf almost immediately (I used to suffer with cramps after riding but now drink plenty of electrolyte and it's not usually an issue). I have no problems MTBing as far as I need to go - it's just the running stage that really lets me down.
I don't tend to stretch before any exercise as I have had conflicting views on whether this is good for you. I do try and warm up into any riding or running though, taking it easy to begin with.
Should I be stretching between the ride and run? After the run too? Any suggestions on what stretches? Anything else I should do (other than give up the running)?
I'm doing the Endurancelife Coast to Coast (2 day) in September and am now getting worried as it ends with a 19 mile run :-(
Many thanks in advance for any advice.
I don't tend to stretch before any exercise as I have had conflicting views on whether this is good for you. I do try and warm up into any riding or running though, taking it easy to begin with.
Should I be stretching between the ride and run? After the run too? Any suggestions on what stretches? Anything else I should do (other than give up the running)?
I'm doing the Endurancelife Coast to Coast (2 day) in September and am now getting worried as it ends with a 19 mile run :-(
Many thanks in advance for any advice.
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Pedal at about 70rpm min.
I haven't tried spinning faster, so will try that thanks. I do have my seat quite high as find that more comfortable - will try dropping it a bit and also check my SPD's. They're probably just forward of level with the ball of my foot.
When training for a duathlon I was told by my chiropractor mate that spinning pedals in reverse near to end of ride before transition helps stretch out 'cycling' muscles which will help going into the run. Not sure how good this is but I did try it, getting funny looks are part of the deal !
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