<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cakake &raquo;</TD></TR><TR><TD CLASS="quote">Mine appears to have a hollow rear, but I can't tell how big it is, and I don't have a rear stand yet so haven't taken off the wheel to actually measure it, although it looks smaller than the front.</TD></TR></TABLE>

You should be able to tell if it is hollow or not without a rear stand. Also, you should be able to measure it without taking the wheel off. Take the nut off one side and measure it. I dunno about the ST4.