Fred Whitton - advice needed

I got in (sorry). this is first time for me. i have ridden some of the climbs (wrynose, Kirkstone) but not all on the same day, I have a steel audax bike (Hewitt) which is hefty but very comfortable with 28c tyres on it. Would changing to 23c s on the day make any difference or indeed be advisable?
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I don't know what time you're aiming for but 'comfy' on say an 8 hour ride is very important (apologies if you plan to do it in 6). If you changed to 18's, by the time you get to Hardknott at 100 miles, I can guarantee they'll have begun to look like tractor tyres and feel like they weigh more! ;-)
I've done it on a tandem with 'chunky' tyres (that means I've no idea what size they are - 32's?) and I've done it on my road bike with 23's and while I went a tad faster on the road bike the last thing on my mind were the tyres.
I wouldn't worry about it too much. If you'd feel 'faster' on 23's then maybe that'll give you a psychological lift? Otherwise, just enjoy the day and the suffering.
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Ruth
My winter hack
very comfortable but heavy
Kenesis Racelight
reasonable comfortable 22 lbs but not brilliant brakes (deep drop)
Yellow Peril ( ill Volpe alloy frame with carbon fork)
harsh ride 20 lbs with Ultegra/105 kit
It's really down to the Kenesis and Yellow Peril , I think it will depend on the day as the Kenesis has mudguards and the Peril doesn't. The Kenesis has the lower gears the Peril has better brakes,
decisions decisions
Wish I only had one bike
Fail to prepare, prepare to fail
Hills are just a matter of pace