The frame is 19" center to top. Estimate 23" top tube, or 23.5" effective top tube. 125mm rear spacing for a 26" wheel. The frame has no damage but it does have marks from use. There are no cracks either, despite a few lines that look like they might be. The shock seems ok for me but I can't properly evaluate it, so please consider that it may require some service to function proper.
