Bird Aeris 9 is a 160mm or 180mm travel aluminum enduro bike with adjustable geometry; a frame costs £1,430 and complete builds start at £2870
The Aeris 9 is the most adjustable mountain bike we’ve seen from Bird yet. In addition to the two travel configurations, there is also scope to increase chainstay length from 440mm to 446mm by virtue of a flip-chip at the chainstay pivot location; it also lowers the BB height by 7mm and slackens the head angle by half a degree.
The bike comes in sizes M, ML, L and XL. Bird don’t specify a range of rider heights for each frame, indicating just one middle-ground rider height suitable for each frame. At the smaller end, a rider height of around 5’6″ is indicated for the Medium frame, while a rider height of around 6’4″ for the XL. It should be noted that the Aeris 9 reach figures are very generous; 457mm in Medium, 486mm in ML, 515mm in Large and 544mm in XL. Wheelbase on the latter is 1330mm.
The Aeris 9 is said to work well with air and coil shocks; Bird are now able to supply complete builds with suspension components from Formula, such as the MOD Coil Shock seen here.
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