Indian never had 21" wheels--unless you are talking about the recently deceased modern Harley clone. Anything can fit anything.
If the spoke count and pattern are the same wouldn't you just lace the Indian wheel to the Triumph hub?
this is what i was askin about http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=10064&item=2434730637
short answer, NO Long answer, yes with some extensive modification. Depending on which triumph front end you have it may be impossible to do, some may need new triple tree to widen the forks and a custom built axle if you intend on using the hub on that wheel. Otherwise if you want to relace a wheel "rim" onto your triumph hub the spoke count looks wrong. Most stock Trump wheels are 40 spoke. That wheel looks like more than 40 but I may be wrong. If it is 40 spoke you will need custom spokes for it, no big deal really. It may just be cheaper to buy a new wheel and spoke kit from a brit bike supplier.
dude, if you need it go ahead. that is why I posted. I wasn't sure if you were going thru the trouble. of converting it for truimph. but its not like it is a misspelled listing or anything. that*****er is going to go up to a couple hundred bucks, not much more if that. I usally don't bid till the last minute anyway, keeps the prices down. but if you want it, pm me and let me know what you price point (what it's worth to you) is. I won't bid on it at all, until, if or when it exceeds that.