Hello,
For those looking to lower the overall gearing on your 700 XR this 40t chainring works great.
https://www.amazon.com/gp/product/B001PPCCFK/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1&psc=1
I was able to re-use the stock bolts (goes in the outer holes). I live in a very hilly...