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which 250 does 70mph for a longer stretch reliably? sure, a highly geared bike on a flat road without wind etc, but even more powerful 250s feel rickety and vibrate a lot at those speeds or if they have a heavy frame they may feel stable but only get that fast downhill twice a year for 30 seconds.
so i also reckon 70 means "absolute top speed observed from time to time for very brief periods".
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS  + 2007 Zongshen LZX200G + DR400SM
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