I had used Progressive for many years and yes, they did cover gear and modification to the bikes. I don't remember if it was optional coverage or not, but my son had occasion to use it on the way to Mail Pouch one year. After purchasing a new Thruxton last February, I switched insurance companies. Progressive wanted to double my insurance yearly premium because I added at 7500.00 bike to my other two? I switched to Dairyland and my rate for 3 bikes is almost exactly what I had before. I carry full coverage year round on all my bikes. I have coverage for gear/accessories up to 5,000 dollars. I don't remember what it costs me, but it isn't much...the total premium is 407.00 dollars a year for 12 months/3 bikes.