two or more pairs of running shoes can produce the following benefits:
(1) reduced risk of injury.
(2) extended lifespan of shoes.
(3) flexibility to use different types of
shoes for different types of runs.
takes up to 48 hours after just a few miles of running for the midsoles of running shoes to fully recover their shock absorption
properties. Allowing them time to recover at least that long reduces one's risk of injury and extends the life span of the
shoes. In his book, “The Competitive Runner’s Handbook”, Bob Glover says, “Studies show that by alternating two pairs of shoes they’ll last longer than three pairs used consecutively.”
He also says, “Rotated shoes retain 80% of their cushioning after sixty runs
of an average of 5 miles (300 total miles) compared to only 60% for those not rotated.”
As long as one doesn't
run on consecutive days, it isn't really "necessary" to rotate multiple pairs. However, it's still a good idea in order to
stagger the "age" of them. That enables "retiring" one pair while others in the rotation are still "young".
to rotate three pair. When it's time to retire the oldest pair, I have two other pair in the cycle with 1/3 and 2/3 of their
lifespan remaining. I usually use the "youngest" pair for racing and speedwork. For a marathon, I introduce a new pair into
the cycle a couple of weeks before race day, get 25-50 miles on them, and then wear them in the race.
People who are
biomechanically neutral can run in different types of shoes (motion control, stability, cushioned, light weight trainers,
racing flats), as well as different models, for different purposes....daily running, long runs, speedwork, racing, etc. Although
I run in one model of shoe today, I used to have up to three different models in my rotation, but all were of the same type
(stability), which I need to control my moderate overpronation. I once introduced a pair of light weight trainers into my
regimen in order to have lighter shoes for races. Within just a few months, I developed iliotibial band syndrome (ITBS) at
the hip because the light weight trainers didn’t adequately control my overpronation. Although I wore them only 1/3
of my mileage, that was sufficient to result in the injury.
do you know when it is time to “retire” a pair of running shoes? Some people mark each pair….1/2/3, A/B/C,
purchase date, date of induction into the rotation, etc. Some people log/track mileage on each pair. Or you can cut a notch
on the edge of the sole after each run. ;)
just keep them on a rectangular shoe tree/rack that holds up to four pair of shoes and I use them in a clockwise rotation.
I remove the inner soles after a run and reinsert the inner soles of the last pair I ran in at the same time. So, the last
pair used is always the pair with the inner soles removed and the next pair up is the pair in the clockwise position from
them. The exceptions to that pattern is when I use the youngest pair....the ones that smell "best"....for a race or speed workout.
I don't track specific mileage on each pair. I just
assume that, because of the rotation pattern, each pair is getting approximately an equal share of mileage. I do log my miles.
So, when I reach a 600 mile multiple in my log, I retire the oldest pair....that's the ones that smell "worst".
Seriously, youngest and oldest pairs can be easily determined by the amount of outer
sole wear and how dirty the uppers and strings are....I never wash running shoes, which is why my wife makes me keep them
in my shop in the basement. :)
Rotating two or more
pairs of running shoes is a good idea for anyone who runs on consecutive days regularly, or even just occasionally.