I'll just throw in an observation here for anyone considering riding a bike part of the way.... and that is to think about how you will carry your pack.
If you're going to use a bag transfer service, then there is no issue.
However, if you want to carry your pack yourself, you should think of the best way to do this.
Carrying it on your back is not comfortable. At all. Nor is it particularly stable. If that reads a bit meh.... I mean you
really don't want to carry your pack on your back!
Strapping your pack to a rear rack is the obvious solution, but it means that the weight is located higher on the bike, which in turn makes the bike more unstable. Throw an unfamiliar bike, loose surfaces, climbs and descents into the mix and it can become more difficult. Furthermore, if you ever need to push up a steep uphill, weight located high on the rack will make for an interesting climb!
Panniers, where the weight is carried lower down on the bike is by far more stable, so enquire about those wherever you are getting your bike. And put the heavier items in the bottom of the panniers.
Not everyone will agree with me, but I don't believe any specific cycling clothing is required except for gloves and glasses.
Gloves will help you keep a grip on hot, sweaty days and protect your skin in the event you fall. Glasses will keep the bugs out of your eyes on the descents.
Bikes are great for the simple reason that you can range further than on foot. No room at the inn? Just pop on down to the next.
Something interesting over there? Just toddle on over and explore.
Is this the perfect place to spend a few hours? Soak up the view and still make it in time to catch a place to sleep.
And best of all, exploring the bigger cities at dawn. You can get to see everything, no traffic and watch these places come to life! I highly recommend it!
I'd caution anyone against using a bike because you can go
faster as well as further. There are times and places where you simply cannot if you want to take the path as opposed to the roads.
Depending on the time of the year, there can be lines of pilgrims leaving in the early morning. And as noted above, some paths are narrow. Walking speed only. Of course, you can make up time later in the day. In fact, often the paths are completely empty at that time.
Finally, everyone thinks they can ride a bike..... and most are correct.
However, there is a difference between riding a bike and travelling longish distances, on Camino paths with baggage. I would strongly suggest that unless you have experience you beg, borrow or steal a bike at home, load some weight onto it and go ride the worst surfaces you can find wherever you live.
Buen Camino