It depends on what the century is like. If it's flat and easy OK, but if it isn't you might need to re-think.
IN NZ one of the local gym chains did a "Train for Lake Taupo Cycle Challenge". This is a 160km ride that is very hilly as well as lots of descents, some technical.
The gym offered a package which was 3 spin classes a week plus one on road ride in the weekend, plus one practice ride on the course a month beforehand.
I am sorry but this is NOT how to train for a for what is for most people a 6 hour+ bike race/challenge. I meet a few people doing this and their bike handling skills and ability WAS lacking big time. I feel the gym was very irresponsible in how they promoted it and sold it. The gym said they had 50% turn up at the race in the end and was proud of that. I think it means they didn't sell or design the package right.
Being on the road in all weathers is part and parcel of an event. Sometimes you have to just get out there (if it is safe to do so of course) and ride in windy or damp conditions.
Are you also riding in a group when you do get out on the road? It's really important to learn to draft, signal and communicate with the people riding with you otherwise accidents happen. Yes spin classes will build strength and fitness but on the road saddle time is the most important thing. Do try and get outside rides as much as possible.



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Also, make sure you do lots of hills on your weekend rides. You should be fine. A century is certainly a challenge, but is really doable for someone in decent shape.

