How do you tell an Ultegra cassette from a 105?

Triathlon Forum
1

I have a 12-25 9-speed cassette from about 2002. How do I tell if it an Ultegra or 105. I think it is an Ultegra, but I want to be sure.

2

ultegra will have an alloy spider to connect the largest cogs. 105 just has the straight spacers all the way across (I think).

Either way, it doesn’t really matter. Both work very well.