I have searched through this forum looking for some answers and seem to have come up without enough information for me to make a decision. So any input the experienced winter commuters could provide would be really helpful. The image attached below is my daily commute to and from work, as you can see I have some major elevation changes to deal with, and none of it is straight. I am trying to decide if it is worth the cash to upgrade the bike I am building into my winter commuter to disc brakes. We don't normally have a lot of snow in the winter compared to some areas but the roads I ride are not major thoroughfares so the snow removal is not great at best and I am concerned about trying to stay in control on the downhills with snow and ice to deal with. Anyways I am starting to ramble so any advise would be appreciated.