Chain ring compatibility

[tonycollinet]

My new bike has one of these on (45 tooth, 9 speed chain compatible):
Shimano Alfine FC-S500 chainring 45T 1HD 4500

The bike is fitted with a 1/8th chain.

For when I need a replacement, one of these is significantly cheaper (nearly half the price in 45T), but designed for 3/32 or 1/8th chain.
Thorn 130mm 5arm reversible SINGLE ring - Black 3/

Will it fit?

[Tewdric]

Yep. 

<edit>

You're only issue might be the thickness of the bolts that hold it on, as the Thorn chainring is quite thick.  It will last a long time though as you can flip it to wear the other side of the teeth out!  Should be fine though.

[tonycollinet]

Oh goody