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There really aren't that many BCD standards, whatca bitchin' about? 4-104, 5-94, and the oversized 5 bolt standard (can't remember the measurement) are about the only really widespread patterns.
The 110 BCD comes from road, it was the first one out there, then people wanted to run smaller rings for climbing, so microdrive(94) came about, Once ring size was somewhat standardized they looked to a lighter system, hence the 104x4 one less arm and bolt, made for a lighter set-up.
Road was 130 BCD. 110 was the standard mtb BCD until people went compact which gave us 94. All of these were 5 bolt. Then someone decided we could go 4 bolt, thus 104. Why they all still exist is a mystery to me. I thought most people now ran 104, for mtb at least.
I have one of each. That makes things suck a little. I like bigger rings for true XC, but big bikes are heavy and require smaller rings for my fat ass.
sh**, do you know how much money they make from each time some poor sucker like me ends up with a hodgepodge of mixed up drivetrain parts that dont fit, and I have to buy new ****? A bunch, I bet.
Why is it so hard for people to understand ever-evolving "standards"?
As the sport evolves so does the equipment to meet modern demands. Simple as that. No company is attempting to profit by introducing a new standard that forces you to buy new gear. On the contrary companies introduce new standards in an effort to evolve and offer you the best possible equipment to improve your riding experience.
I used to run 5x110 XTR Octalink Hollowtech cranks because I could use a 24/36t with a basher or an LRP. Now that dual-ring setups are much more common I run 4x104 XT Hollowtech 2 cranks with a 22/36 and a DRS. That is the best setup for my riding hands down. Do you hear me bitching about having to spend some minor coin to have more fun riding?
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