Originally Posted by
Sangetsu
The Birdy is a faster bike, it is lighter, and has more gearing. However, the Birdy is a little prone to squeaks, rattles, and creaks. These are usually easy to track down and fix, but the Brompton doesn't seem to be bothered by them. If you live in the city, and your commute is fairly level, the Brompton is a great choice. If you like longer rides over more various terrain, the Birdy would be more suitable.
Which wheels are better overall? The 16" for weight-savings, 18" for ride smoothness. I'm not looking for speed and right now I'm thinking of going with the 18x1.5 Marathon Racers.
How much difference would there be if the limit of my rides would be non-technical trails with protruding roots, soft grassy patches, etc? I'm trying to differentiate it from my M6R, so I wouldn't want the 16" if it's not going to be a big enough upgrade over the Brompton in terms of ride quality.
In your subjective opinions - what is the types of wheels you've been happiest with and why? Thanks.