upanbike montain bike chainring guard 104 bcd aluminum alloy chain ring protector cover for 32~34t 36~38t 40~42t chainring sprockets (red, 36t~38t) upanbike specifications</br> material:aluminum alloy</br> color:black;red,blue,silver,golden</br> bcd:104mm</br> size1:suitable for 32t~34t bike chainring,diameter 156mm</br> size2:suitable for 36t~38t bike chainring,diameter 160mm</br> size3:suitable for 40t~42t bike chainring,diameter 175mm</br> neighboring hole distance:74mm</br> weight:about 140g</br> package included:</br> 1 x bike chainring guard</br> features:</br> 1.this chainring guard is durable and corrosion resistant,effectively prevents grease from the dirt chain,which offers a long time cycling.</br> 2.light weight and classic design,adding no heaviness to bike.</br> 3.the ergonomic round design creates more stampede traction,which relieve the fatigue of leg or knee and ensures a smooth cycling.</br> 4.please make sure if the dimensions of your crank set is applicable to this cover and make sure if your crank ring has 4 screw holes.</br> 5.note: please determine your crank bcd specification carefully before buying.</br>