Bike fit / correct riding position

oh hai ..
why do i get numbness in the bollocks region only when I am on rollers and never ever on the road even after 100 miles or richmond 3 laps ? I have also noticed I put more weight on hands while on rollers .. are they constant downhill angle? Or is my flat?

Simple - you're static on the rollers.

One thing you forget is that you never stay in the exact same position for the entire 100 miles compare to riding the rollers inside your slightly askewed flat.

You might stand up on the saddle to climb the Col d'Wimbledon Hill, you wait at the traffic light sitting on your top tube like a prommuter in Kingston, you shift back as you perform your splendid attack at Sawyer Hill to chase your fellow MAMIL on his orange Allez, or simply ride on the very nose of your saddle and arm tucked in, in a last ditch attempt at trying to stay under 1 hours during the notorious three laps challenge.

So I am putting more pressure when static? If so why? Does the same thing happen with turbo + riser block?

Compressionless housing?

Or is it yoga? I forget :-/

I think there is some leaning into the air going on when one actually rides. @edscoble's gonna shit.

Does the same thing happen with turbo + riser block?

I think it's worse.

fair; I take roehampton lane scooble

One observation on my part...

I didn't quite understand why my fixed (170 mm, miche BB, miche cranks) felt more comfortable than my tourer (also 170 mm but a triple...and a wider BB). As my left knee occasionally niggled slightly. So I moved the cleats in on my second pair of shoes which helped.

Well, I suspect it's the Q factor. Now obv. the difference between a track frame/bb and a triple frame/bb is going to be massive, but if you find despite cleats, saddle etc. adjustment something still doesn't feel like, may be worth looking into Q factor. Perhaps your new frame has a wider BB, crank spacing etc...

Q factor can make it feel like you're duck footed on the tourer, does it have an MTB crankset?

oh hai ..
why do i get numbness in the bollocks region only when I am on rollers and never ever on >the road even after 100 miles or richmond 3 laps ? I have also noticed I put more weight on >hands while on rollers .. are they constant downhill angle? Or is my flat?

I have the same. Can only go on the turbo for an hour tops before it becomes too uncomfortable. Not numbness, more like general ass pain as if I was using an uncomfortable saddle, however on the road I can ride all day without issue on the same bike.
I also feel like I have more pressure on my hands. I've always assumed it's something to do with not being on an actual moving object.

positioning of the cylinders may be putting you in a permanent slight down hill position,

i have the same and only noticed after I once repositioned my saddle while it was sat on the rollers, took it out side and everything was all wonky

Ultegra 9 speed triple actually :)

Should measure it up and adjust cleats accordingly I'd say, as I'm comfy on the Gazelle.

It may well be that you are static on the bike when using the turbo. IRL cycling your weight moves around when cornering etc, as you accelerate you push harder into the pedals briefly lifting yourself up a bit, standing up to go up hill etc, stopping at junctions etc. All of these will allow a better flow down below.

@amey

You're 20 days too late, I already explain it in this post.

I don't think it's as simple as saying you move around on the saddle more, as after a number of hours the amount of time you're in each position would add up to be the same as the one hour in one position on the turbo. I have a feeling it's more to do with the gyroscopic effect that keeps your bike balanced, and the lack of it if you're not actually moving.

The moving around relieves the blood supply down there. So you don't spend 60 minutes restricting blood flow when on the road.

blood flow isn't the problem, I have a saddle with a large cut out for that.

It depends where the flow is restricted, the edge of the cutout may be where the blood is impeded.

Next time you do a turbo session try standing up regularly just for a few pedal strokes. See if it makes the difference.

I don't think it's as simple as saying you move around on the saddle more.

I genuinely think it is, when you go out for a ride, try and note down the longest you've stay in a single position.

On the road, you're constantly shifting when riding, you coast a lots more, you change gears more, you use the brakes (body move forward under deceleration) you lean for chrissake.

No one leans anymore
#scobleknowledge

Fucking leaner.

I recently had a bike fit and I was recommended a 54 c-c top tube with a 90mm stem and 77 cm between the top of my saddle and the center of the bb. Turns out I have massive knee overlap as well so I need lots of setback (seatpost recommendations?). I'm thinking about buying an FM296 from Hongfu. Now if I were to buy one should I get the 55 with an 80 mm stem and roughly 180 mm post showing or a 53 with a 100 mm stem, roughly 210 mm of post showing and a spacer stack? Will the slacker seat angle of the 55 help against my knee overlap? Also, do longer cranks help against knee overlap?

NB: I was fit using the Serotta method.

The other option you can look into is the handlebar reach.

What bar were you using that result in shortening the stem to 90mm? does your bike fit tell you your saddle to bottom bracket horizontal distance?

Also, just what you mean by knee overlap? as in kneecap touching the handlebar?