Easton arc plus mtb rimeastons arc plus rim comes in 2 internal widths the arc 40 is a true plus rim with a 40mm internal rim width but in a lighter package than the arc 45 which is the widest rim easton makes between these size options easton has the perfect rim for every 27 5 and 29 bike all arc rims are tubeless ready with an excellent track record of securing the tyre bead of all major tyre brands features materialwelded aluminium rim depth20mm spoke holes 32 finish brushed blac