I'm looking at using a Grubee Aluminum Motorized frame the GTA with curved down tube for the basis of a retro style Indian cruiser build. I'm about ready to pull the trigger on buying the frame but I have one major question for those that have used this style of frame for a build similar to this. I will be using disc brakes front and rear (found a dual cable lever that can be used to operate front and rear discs) and will be using a single speed bicycle drive which means I should go with the 135mm frame width. But I am wondering can one use the wider 150mm frame width with a single speed set up? I don't want to spend $170 for this frame and realize I should have gone the opposite way.