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I'm riding a Cervelo S5 - previous generation - setup for TT and dirt from the road will scrap the frame using an aluminum track 404 and HED disc with a 23mm GP4000sII and Pro4. Presumably, if you go with a wider wheel, you're going to want a wider (and therefore taller) tire. I've bought, but not mounted 20mm tires to resolve the issue.
So I tried Zipps (404), Heds (Jet 6), and the OE Reynolds Strikes. All of these wheels work just fine with 25mm tires mounted. No brake track rubbing. No frame/tire rubbing w/25mm tires, unless I have the wheel mis-aligned in the rear-entry dropouts.
Back in the saddle!
Which year B Series?
I have a B12 (2012 previous gen frame) and fit a 23mm wide wheel no problem (HED Jet 5 and Jet Disc) with a 24mm Turbo cotton tire. Trick is to remove the spacers accordingly for pad cartridge holders on the rear calipers.
I recently picked up a HED Jet+ disc (25mm wide version) and adjusted it so it was able to fit no problems (had to remove more cartridge holder spacers) with plenty of room. I haven't fit it with a tire yet but it shouldn't be an issue as my previous 23mm wide setup (with the Turbo tire) had lot plenty of clearance on the chainstays. Planning on using a 23mm GP4kII because I have a new spare one sitting around and the Turbo tire went with my previous Jet Disc when I sold it.
Per a previous Felt rep you would even get 28mm wide HED Stingers wheels to fit in my bike with all spacers removed and low profile brake pads.