Sitz Bones "parts"

[Flur]

Maybe you all can help me. I don't feel "pulled apart" on my saddle but I keep finding myself rolling forward towards my public bone on a long ride, leaving me quite sore. Someone once had told me that I would be able to maintain a better position when my core was stronger... hmmm.. I've now done quite a few miles, and I teach yoga and have a pretty solid core. And I'm still sore. Is it seat position or seat size, you think?

On a side note, I had my bike built for me with extensive measurements and trainer rides... as I'm a 6 foot tall woman with a long inseam and narrow shoulders. But the seat was added almost as an afterthought by the LBS.

Does your seat have a cutout?

[mayanorange]

I had a long response typed out, but the kitten just deleted it!

From what I read today (see the Bontrager thread), we actually do put significant weight on the pubic rami- sometimes more there than on the ischial tuberosities. Especially in the drops, you should be able to tip the pelvis forward onto the rami and be supported. My current saddle unfortunately also tries to support a lot at the pubic symphysis (and thus girly bits), so I'm still hunting for one that has the right shape up front. I'm trying the Lithia tonight on the trainer and have a SMP TRK on order, but if those don't work, maybe I'll try out the new Bontrager.

For those non-anatomists:

[Miranda]

I agree with these guys- I have 145ish sitbones and need 155-160 in my saddle width.

There's new data out on Bontrager's site and in Medicine & Science in Sports & Exercise that shows we don't actually sit on our sitbones on the saddle as much as is lore. But I still think the whole pelvis width needs support and from where you say you are raw- it's either to narrow or too much curve right to left.

Discussion of the bontrager info here: http://forums.teamestrogen.com/showthread.php?t=25618

This was a saddle I was asking about recently also. My lbs did not have it yet last I checked. Just the sit tool. Thx for the link. What always kills me in the lbs when I tell them my sitz bones are not on the saddle is the sales rep insistance that a 155+ saddle is soooooo wide... like omg, lady, NO ONE needs that big! Where do these folks come from? Twiggy land? Ribs you can count on me, yes. But I didn't push out 10# kids being a Twiggy in the lower half. The bones down there are way wider on my pearish body.

I had a long response typed out, but the kitten just deleted it!

From what I read today (see the Bontrager thread), we actually do put significant weight on the pubic rami- sometimes more there than on the ischial tuberosities. Especially in the drops, you should be able to tip the pelvis forward onto the rami and be supported. My current saddle unfortunately also tries to support a lot at the pubic symphysis (and thus girly bits), so I'm still hunting for one that has the right shape up front. I'm trying the Lithia tonight on the trainer and have a SMP TRK on order, but if those don't work, maybe I'll try out the new Bontrager.

For those non-anatomists:

God Bless you for finding this in google. I kept doing searches and didn't find this good of a diagram. Inferior pubic ramus... if that is part of the downward sloping bone to the sitz... that's where I think my pressure rests. Seems like Knott once posted a name for that inner line of the bell curve "ishchial something something". I know when one rolls forward to more aero, like hoods to drops, you will be hedging towards the inside of the bell curve. I tried to pick some flater toped saddles, vs sloped. Maybe the slight slope is hitting wrong. I think it's close, but not quite. btw... the cat kicked me out too earlier, thus how I ended up coming back later... thx for persistance in posting.