Just a thought as I could do with a lower gear or two for Rourke's Ride in October. Rather than buy a cassette with a 28 tooth sprocket I was wondering if I could get a smaller chain ring. Currently 34 on my Ultegra (110mm BCD). Is there anyone doing a 32 or 30 even? Or would they be too small for the ring bolt diameter. I have had a search but nothing smaller than 33 that I can find. I think I'm out of luck!