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23s are pretty cool on a light flexy steel frame imo
If you have a modern stiff road frame or a stiff hiten shitter then 25s will give you a stiff/ stiffer ride than a flexy steel ride with 23s
Just my 2c
also i really like pro 4 service course, 23s and 25s, but they're not nearly as durable as 4000s II, and i fubared a new one underbiking