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They look good, but if the stated weight (365g!) is accurate, I reckon they're probably steel. Having said that, the blobby welds look more like aluminium ... Anyone volunteer to be guinea pig?

MC34 - 94mm bcd: http://bernd.sluka.de/Fahrrad/Shimano/T ... 4_1996.gif MC33 - 58mm bcd: http://bernd.sluka.de/Fahrrad/Shimano/T ... 3_1995.gif RC21: https://fstatic1.mtb-news.de/img/photos ... Spider.jpg

The RC21 adapter is for the earlier STX cranks that used a 58mm primary bolt circle and mounted the outer ring on the 58mm middle. Your MC34 crank uses a 94mm bolt circle, and the granny is mounted to the middle ring. The outer and middle rings mount to the spider as normal. You can't attach an...

In that case I reckon you've got a smooth '94 Explosif. Congratulations! I wonder if the original decals are still there under all that yellow paint ...

The toptube is clearly slimmer than the downtube. That rules out the Kilauea, so I guess it's one of the '94 Explosifs after all. There appear to be ridges visible behind the "KONA" downtube transfer in the full-size version of this picture: https://s31.postimg.org/6kvtmwt09/GOPR1928_kopi.jpg...

It gets weirder! So it looks as though there are three variations of the '94 Explosif around: the "normal" version with a ribbed Tange Ultimate Ultrastrong downtube and smooth Ultralight toptube, another variation with a smooth Ultralight toptube and a smooth (presumably Ultralight) downtube...

From this picture, it looks as though the toptube and downtube are Prestige Concept, i.e. they're ovalised and tapered: https://www.flickr.com/photos/jabbi/279 ... 9/sizes/h/ Is that correct?