Originally Posted by
gyorpb
Because, if your cable snaps, it'll jump into your rear wheel rather than away from it.
.tsooJ
Well, if the limit screws are set correctly it won't go INTO your wheel, but yes, it will go to the largest cog.
Easy fix on the road if you don't have a cable though, just re-adjust the limit screws so it sits on a gear that's more appropriate for you to get home or to a bike shop.