203mm rotor adapter is too big, what size should I have got?

A community of cyclists - some with questions, some answers
Woman having mental health issues on london/Albert Road.
A subreddit for and about Sheffield (the City, the City Region, and bits around it, including the Peak).DIY lowrider bucket/coolcave style panniers
This is an adventure-biking sub dedicated to the vast world that exists between ultralight road racing and technical singletrack. All-road, crossover, gravel, monster-cross, road-plus, supple tires, steel frames, vintage bikes, hybrids, commuting, bike touring, bikepacking, fatbiking, single-speeds, fixies, Frankenbikes with ragbag parts and specs, etc. are all fair game here. The unifying element is the mentality! Ask a question, share a thought, post a photo, connect with other riders.DIY low rider bucket/coolcave style panniers
Join our community to learn and share how you make your own gear (MYOG). Tents, tarps, hammocks, stoves, packs and anything else you can think of outdoor gear related.What are the domed plastic washers inside panniers called and where can I buy some?
Join our community to learn and share how you make your own gear (MYOG). Tents, tarps, hammocks, stoves, packs and anything else you can think of outdoor gear related.Good indepth video about the much posted PZL Mielec M-15
A subreddit spawned from /r/weirdwheels with the same intent, only with planes! This sub is for documenting all those strange planes out there from prototype to production. All aircraft are allowed, including helicopters (despite the sub name).Do fish owls have the same lack of waterproofing as other owls?
General subreddit about birds and bird-related topics, including bird art, bird science, questions about birds, and bird pictures.Mid Sole Ice Cleats. A solution to the problem of how to ride with ice grippers.
Sustainably commuting by bicycle.Anyone used vibram arcticgrip soles as a solution for riding in ice?
Sustainably commuting by bicycle.Another roundup of illegal ebikes this time in Sheffield. If you ride in an urban centre want to keep your ebike stay legal.
A little space for us UK cyclists.An allotment tree has blown over and landed on my workshop. Who in the council do I contact to deal with this.
A subreddit for and about Sheffield (the City, the City Region, and bits around it, including the Peak).A triple with quite a few triangles

This is an adventure-biking sub dedicated to the vast world that exists between ultralight road racing and technical singletrack. All-road, crossover, gravel, monster-cross, road-plus, supple tires, steel frames, vintage bikes, hybrids, commuting, bike touring, bikepacking, fatbiking, single-speeds, fixies, Frankenbikes with ragbag parts and specs, etc. are all fair game here. The unifying element is the mentality! Ask a question, share a thought, post a photo, connect with other riders.