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@weazlepopper
I'm currently running 42x17 which is about 66 GI with 28/700c. I was on 42x15 but thought this was too high for London as just moved over from france where i mainly rode my bike on a flatish 30km piste. Thinking I could cope with 70 GI now im a bit fitter and used to the journey. Hoping to move closer to work too so my round trip should drop from 25km to 10....maybe. I also dont want to break my knees so may end up going back to my old current ratio if they start hurting. just want to be faster..
I just invested in a 17t sproket hence trying to keep that and get a 44t chainring but I guess the sprket is the cheaper component so could think about changing that.
The crankset is off an 80s Peugeot triathlon bike and is branded 'custom'.
My bike rides pretty well but I'd like to upgrade in the future and have components I can take over.
Frame cost me €30 as a complete bike (pm me if you want o know some french markets where you can pick up hundreds of bikes for proper cheap!) and its had various bits and bobs added form my other projects.