Hola - well if your Spanish is up to it you should be able to negotiate a package that includes at least the carry rack. The panniers you can keep, (if good quality they are quite useful). If you are only doing Burgos to Leon then renting is the way to go - and that should include a bike with a rack and panniers can also be rented. If you heart (and legs) are set on going all the way then buying might be better - as long as you can get a suitable bike for under E200. After Burgos you can pretty much follow the walkers road on a hybrid or even a road bike - as long as the tyres/tires are around 24-28mm/1inch wide. Front suspension would be a bonus (as long as you can lock it in or out) but not really necessary. From Rabanal I pretty much used the roads - the camino walking tracks ran close to the mainroad but were just to uncomfortable, particularly on the down-hill from the Crux and about half way down from O'Cebereiro towards Triacastela. If you are bike/road fit you can do Burgos to Santiago in around 14/15 days (including a rest day in Leon and maybe half a day in Astorga - at the chocolate shop and museum. Check out the bike rental places on line and then check the sports shops/bike shops to see what's on offer. You should be able to sell the bike in Santiago - a uni student might be a good option or one of the bike shops (provided its in good condition) but they are unlikely to offer more than E60-70 as they will on sell it for between E80-100 (and they have the luxury of time to wait until their buyer come along) Good luck.