Some rollers have bumpers on the front so if your front wheel moves too far to the right or left it will stop. Without the bumpers you will potentially fall over. The ones I have have the bumpers and its good because sometimes I am zoning out and lose concentration and they just stop the front wheel from sliding off. I did 45 mins last night on my rollers because it was raining in the morning and didn't have anytime after work to ride outdoors. And its impossible to go over the bars.




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