I think the 1 1/4" would be total overkill, unless it's hollow, and/or you are up for some serious road racing. I thought mine was 1 1/8 but it's only 1" and it's plenty.I put a 7/8” bar on my 55. It’s a 1000% improvement over the no bar it came from the factory with. People always stress over 1” or 1 1/4” bars when the cars came with nothing. ANY bar you put on there is going to be a vast improvement.
Sounds good for road racing on curvy roads! Shit, now you are going to make me want to get a bigger one. I can see where an adjustable rear would come in handy with one this massive in the front.Hellwig used to make a 1-1/8" bar. They have dropped it and now offer a 1-1/4" bar.
Hellwig also makes adjustable rear bars.