This season I started to bike a lot, and got a new road bike. The reason was because I started doing triathlons, and I got three triathlons in this summer. I noticed though, that I really like biking. When I train, biking was always what I was most enthusiastic about. Anyhow though, my triathlon season has come to an end because cross country for my high school is starting (I must do cross country). Right after cross country is the swim season, which concludes in february.
My question is on training in the winter. I will be running cross country from now on full time and swimming maybe twice per week (no biking) until mid october, at which point I will start swimming full time with running maybe twice per week. I probably won't be biking again until very early March.
If I were to bike on a trainer regularly during the winter, would that do a good deal of help for me, for next biking season? Next year is when I want to get in some bike races. Like I said, I will be running and swimming from now through March, constantly. Will this help my biking in any way? Would it be worth sacrificing swimming and running training, to be biking on the trainer, for preparation to next year, or since either way I will be doing athletics all the time, it won't make much of a difference?
Basically, if biking on the trainer vs. swimming and running would be greatly better for next biking season (for racing), then that's probably what I will do. Otherwise, I'll just swim and run...what do you seasoned bikers have to say for this?
Thanks in advance.
EDIT: Obviously, bike training is better for biking than running or swimming, but I'm wondering if the impact will be significant enough to sacrifice swim/run training, if next biking season is my main focus.