Shaking / twitching legs... help?

eZ peeps!
OK this may seem weird but I get a seriously comical twitch of the legs right after I dismount my bike to lock up & go to work.
For the first few weeks I thought nothing of it, just figured its my legs getting use to SS road bikes (I use to use derailleurs before), but now a few months in, I'm still shaking!
I cant figure it out, is it something to do with the way I ride (I don't think I ride fast at all) is it down to my bike geometry...?is it my diet...?I'm a fairly fit, single guy but I cant for the life of me figure whassap with this twitch..its driving me up the wall.
Now after I dismount I gotta spend a few minutes trying to slow down this shake, coz if I walk right after dismount it feels wrong and im sure people have noticed (Its that pronounced)..Has anyone ere had the same experience or is this a GP job?
=[
Zep

As a guess... trapped nerves? i.e. a shit position/geometry? Or really bad saddle pinching the top of your leg and trapping the nerve there?

How can I tell if its trapped nerves Velocio?

Do you drink alot of coffee in the mornings?

Tape a deraileur to your leg?

My leg muscles shake as well after a ride, but then I ride faster than the wind as well!

How can I tell if its trapped nerves Velocio?

Borrow a smaller bike from someone and see how that feels and whether it generates the shakes.

Simply: If this you or the bike? If you don't experience it on another bike, then it's your bike. In which case as it's not you it's some trait of the bike... such as the saddle, or size, or angles, etc.

But you should just get the basic question answered first: If this you or the bike that is the cause? And the simple way to answer that is to borrow a smaller bike and try that for a few days.

Is it a wobbling (unsteadiness) around the knee? If so, try lowering your saddle a little bit. What gear are you running?

@ Charco ~ Not before, but right at the start of work I do.
**
lol @ FatPants** ~ ehehe i don't think me legs are missing derailleurs *that *much!
**
@ Velocio** ~ that's a good method, I still got my old bike and it doesn't happen with that, but I do shift between gears on it...
I don't think its anything to do with the size of the frame, it fits me right when I stand over toptube...

@ Jung ~ im running a 48t chainring to a 16t cog on the rear (i was told thats the best ratio?)

Just thought I'd ask because if I've strong coffee & do exercise i tend to get mussel twitches for a while after. Depending on the intensity of both.

(i was told thats the best ratio?)

careful......

** @ Velocio** ~ that's a good method, I still got my old bike and it doesn't happen with that, but I do shift between gears on it...
I don't think its anything to do with the size of the frame, it fits me right when I stand over toptube...

You're single-speed not fixed... shifting gears makes no difference.

Put your geared bike in a medium gear, and go for a ride without changing gear... do you get the shakes? My bet, no... not because it happens to have a dérailleur that you didn't use, but because that bike fits you better. So I think you've already answered it, the SS bike isn't right for you.

I would concur with velocio

the fit is much more than the height of the top tube. position of knee wrt cranks. saddle height, saddle to stem distance and the drop from saddle to stem.

measure these on your old bike and then see how they compare to the new one. a 5mm difference in any of those measurements wil have an impact on your comfort, speed and power.

@ Jung ~ im running a 48t chainring to a 16t cog on the rear (i was told thats the best ratio?)

That's also quite high. I run 46:16 and that cruises confortably above 20mph, tbh would avoid anything higher than that for stop start riding and hills.

http://www.londonfgss.com/thread16381.html
http://www.competitivecyclist.com/za/CCY?PAGE=FIT_CALCULATOR_INTRO
http://www.prodigalchild.net/Bicycle6.htm

That's also quite high. I run 46:16 and that cruises confortably above 20mph, tbh would avoid anything higher than that for stop start riding and hills.

+1,

electrolyte / sodium imbalance may encourage the muscle fibres to continue contraction post exercise. This is normal, but not very comfortable.
Try extended warm up and cool down, to allow your body to understand you are preparing for exercise, and preparing to stop.
Increase or improve your hydration and if you tend to drink a lot of energy drinks.... reduce consumption.
:)

Your foot is about to explode. You need to get to a doctor. I've seen Exploding Foot Syndrome happen to at least three elite-level bike racers. It's a serious condition that should be treated with respect.

ha ha ha.

I'm a fairly fit, single guy

Well hello tiger!

haha

Maybe it's your 'single guy' blue balls coupled with riding friction. Does the shaking stop after you do a spunk in your pants?

Isn't that when it starts.. wobbly knee syndrome..

Sounds like a case of Disco Fever. Though the last reported case was in 1982.