There are many anime about girls doing some specific activity, with that activity being just excuse to show cute and heartwarming moments. While Long Riders! doesn't lack those aspects, in my opinion it's first and foremost sports anime and should be treated as one - more about it later. Story is as simple as it gets. It follows Ami as she starts her adventure with cycling and slowly gains experience and becomes better. There are many cute and relaxing moments, there is comedy too, but main focus is cycling itself. It's exactly why I see it as a sports anime: Long Riders! puts heavy focus onbikes and cycling. It does excellent (and I mean it) job at showing emotions one feels during their adventure as a cyclist: first bike, feeling of freedom, first 100km and so on. This anime also surprised me with how accurate it was about technical side of cycling. Every episode shared information that you usually learn yourself over time - and managed to keep it natural, without turning into some trivia show. I'm sure person who wrote it had personal experience with bikes - he wouldn't be able to share it so perfectly otherwise.

Sadly, characters are weak point of this anime. While they fulfilled their roles, there was nothing interesting about them. Ami was the only character that got some development. I found all girls rather bland and uninteresting. If this was purely cute girls SoL that'd be a deal breaker.
As a side note: despite being college students they felt like any other group of highschool girls.

I have mixed feelings about art. Backgrounds were really pretty and seeing those bikes made me pause to look at details, but animation, especially moments of mixed CGI and normal animation, was lacking. Character design seemed slightly weird at first, but after getting used to it there were no problems.
And surprisingly there was pretty much no fanservice. Unless, like me, you get turned on by bikes.

Being cyclist myself I really enjoyed it and expect to rewatch it multiple times. Outside of things mentioned earlier, I also found Long Riders! to be very inspirational. I can't imagine any fan of cycling that wouldn't want to stop watching and go for a ride.
Now, I doubt someone not interested in cycling would enjoy this anime. I'll repeat myself here, but it's not exactly CGDCT SoL show. If you came here for cute moments, then I'm afraid you will be mostly bored with all the bike talk.