What is the widest rear tire that will fit under a stock 2003 Softail Night Train?

The stock 2003 Softail Night Train can typically accommodate a rear tire width of up to 200mm without modifications. However, it’s always best to check for any specific clearance issues, especially if the bike has been lowered or modified. If you're considering a wider tire, consulting a professional or referring to the manufacturer’s recommendations is advisable to ensure proper fitment.