Was I taken advantage of for paying more than $30 for a tire repair?
Your $290 bill would suggest to me that you indeed did pay for a tire rotation. Whether you received it or not is the ...
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7 Common Reasons Your Bike Has No Traction (And How To Fix Them)
Too low a saddle can also reduce traction and grip while climbing, causing you to compensate by pedaling inefficiently and bobbing up and down, which will weight and unweight the rear of the bike, ...