Customer Rating:  
Summary: Too bad it's not accurate
Comment: Two very big problems with this computer are accuracy and settings. My wheel circumfrance is 2038mm. Using that circumfrence setting, according to the instructions I compared the GT Computer to my GPS. The result....at exactly two miles by the GPS the GT indicated 3.38 miles. Of course the indicated speed was off (high) as well. I might have been able to eventually calibrate the computer using the GPS except for an even more frustrating problem. Whenever you attempt to reset the wheel circumfrance it automatically defaults to 2124. So you can never recheck the number you set to confirm that you set it correctly and if/when you do correctly calibrate the computer you must write down the number in case you ever need to reset. Also, all other settings (such as clock) go to default settings. So you must reset everything anytime you change any setting. However, the clock is accurate! The only thing I really like about this computer is the mount.
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