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@fullmonty
Yes there are a few types of 531 tubing of the top of my head there is 531st (super touring) witch is fairly light for touring while been heavy duty not ideal for a fixed gear to be fair, there is a standerd type of 531 witch is very common and there bog standerd tubing still fairly light and stiff I presume that is what your bike is made from at your parents if you think its really heavy. There is also 531c (competition) my fg is 531c and personally its amazingly quick and responsive the only thing I have noticed is there is abit of flex from the bottom bracket area witch is anoying thinking about it but trust me its unnoticeable while riding.