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@gbj_tester thanks so much. Sounds like 6 bolt is preferable for me. Will look at that rim you mentioned and then what hubs would you go for at this price point with 6 bolt disc attachment? Or is it fine to use adaptors?
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is it fine to use adaptors?
Adapters are a last resort if you're trying to get cheap or weird size rotors for existing Centrelock hubs.
If you're on QR hubs both ends, Shimano M756 remains a sound choice of 6-bolt touring hub. DT350 Classic is solid albeit at more than twice the price, but they do take all the axles so you can bring your nice wheels with you if you change frame/fork. Even with the Kinlin rims and Alpine IIIs they should just about come under your £400 limit.
6-bolt rotors are very simple to make and therefore cheap to replace when they wear out. The attachment system is well proven and extremely robust, having been used for many decades on all other vehicles with disc brakes. Centrelock sacrifices these attributes in exchange for a weight saving of a few grams.