Iro Angus, and Soma Rush seem like pretty similar frames. The rush is a little more expensive. The Angus is a little less versatile without any bottle mounts, rear brake mount, braze-ons. There are probably many other differences that are less obvious.

if choosing between those two frames which would you chose and why.

they have completely different geometry.

The Rush is made of Reynolds 631, the Angus is not.

it says it is here
https://www.irocycle.com/id117.html

OK, I can read the numbers, but I'm afraid I don't know what they mean. I thought both were considered a "relaxed track geometry" at least that is how Soma describes their frame. That's what I'm looking for basically a good commuter and trainer, with tight handling characteristics.

So how would you describe the differences in geometry in practical terms?

Yea they both have a 631 main triangle, and weigh a little more than 4 pounds. anyone know which frame is the lighter of the two?

My mistake.

i have two soma rush bikes,they are the best,why else would i buy 2.

I'm not sure why anyone would buy 2 of the same bike. I have 4 bikes and they are all quite different. Then again if I had "the best" maybe I would only need 1.

You're afraid of change?

too, the angus is threaded, soma's threadless.

Hey! The thread says "compare" not contrast. Now get to it little spankers.

I didn't think the Rush came with a headset?

Or a fork for that matter, so it's really up to you.

steeper angles, shorter wheelbases, shorter chainstays, less rake, all generally make for 'tighter' handling

both should weigh very similarly... even if one is 4lb and the other 4.5lb, in the end,there isnt that much difference in a 18.5lb bike vs a 19lb one

But I want an 18.5 pound bike!

OK, from what I can tell, the Rush has slightly tighter geometry (unless I'm misreading) but the IROs have less BB drop which equals better ground clearance. Without riding them to feel the difference it's still sort of a toss up. In general I think I want fairly tight geometry, but my biggest reason for wanting to use a fixed specific frame rather than converting a road frame is to get a higher BB. As I get more comfortable riding fixed I find myself scrubbing pedals more and more in my conversion. I'm not really that afraid of pedal strike, but figure with a fixed bike the higher the BB the faster I can ride, and fast corners are FUN.

So with that in mind the Angus is looking like 8 mm more fun than the Rush to me. What's typical BB drop on a track frame anyway?

the rush comes with the fork,but the dealers separate them from the bike to squeez more$$ out of it. my 1st purchase of the rush had fork included for $350.

The dealers separate the frame and fork?
When I went to buy one from Soma's website you had to buy frame and fork separately ($470)
I think you caught a break.

I've found that the 'more comfortable' I got 'riding' fixed gear
the less I found myself 'writing' about it............... (not that I ever did)

You just did. Oh and piss off by the way.

Yes Matt

sucks, huh?

let's re-re-re-visit some of your fixed 'concerns'

Who pissed in your corn flakes, and who said I was "concerned"? I'm just writing about two different frames I'd like to buy, and nobody's forcing you to read it.