Alu single speed track frame. suggestions?

I had a Nelson... I used 25c.

I believe people use 23c tyres on the track (you can confirm with RPM while you are grumping) and a 23c tyre is too big...!

... But the reason the tyre rubs is because the bridge has a square section in the middle to accomodate the brake. It that wasn't there it wouldn't rub as I only had to file the square flush with the rest of the bridge...

Would a "brake bridge" in this case, actually be a seatstay strengthener/reinforcer?...

Reading fails alround then ;)

So kerley - was it especially heavy, or just a 'normal' sort of weight?