Just finished new front(21#) and rear spring (4.8) install today-rear sag set to 95mm with a little too much free sag for me(1-1/4'') mxtech said 4.8 spring is right for my weight(150) so I guess this is right. Front end is much stiffer now and bike really responds alot better for the quick ride I took after installation(can you believe its snowing here). I can really tell a difference so I think the money was well spent and I really enjoyed working on this project. Ended up using metal spacers that came with bike - cut them with pipe cutters, worked really well.