How long have you been riding? When I first started I ended up going from a 110 to a 100 to a 90mm stem but as I rode more I ended up going back to the 110 and eventually a 120. Doesn't mean you will eventually find the longer stem is better, but something to consider if you are still adjusting to the bike. If you do go shorter, might be worth buying a cheap stem or even borrowing one from a shop first. I now have fancy 90 and 100mm stems going unused.