MrEss

I know I'm in the minority here, but I really love the way the Campagnolo Victory and Triomphe cranks look. So, when I had the chance to snag a pair for a song because of a damaged self-extractor, I couldn't resist. Unfortunately, 116mm BCD chainrings are basically impossible to find at reasonable prices.

Fortunately, 110mm BCD is really popular and easy to acquire. Since the difference is only moving the holes out 3mm, they're simple to convert from 110 to 116BCD for use on the Victory cranks!

I took some crude measurements and set about modifying the chainrings with a Dremel cutoff wheel and grinding stone. To fit on the spider, trim a 110BCD chainring so that your cut just nicks the bottom of the existing chainring bolt hole. Once that was complete, I used a sharpie to draw the outline of where I needed to hog out the holes for the chainring bolts to fit.

Here's the result: a Victory crankset with rough-but-serviceable Shimano chainrings. Hopefully nobody'll notice that I'm using "Brand S" on my 36/46 double.

Bianchigirll 

https://cycleunderground.com.au/chainringdesigns.htm

MrEss

I think some of their designs are pretty awesome looking, Bianchigirll, but did I mention that I paid $10 for this crankset? $100 worth of chainrings would ruin the effect, I think.

Drillium Dude 

Welcome to the Drillium Club - nice way to reverse-engineer for your needs!



DD

Alan Edwards

I had a set on my Ciocc and changed it out for a mirage compact 34-50. Did you convert the 110 so you could go compact or just to get some rings. The idea seems great, I'm a garage machinist myself. Looking at the pictures you need to add the counterset so the bolts sit flush. Have you used them yet? I would ask if they flex as a portion of strength went with the lower portion that you cut off. I have never seen a chainring break but I have seen a couple get bent. Wondering how this would hold up in the long term.

MrEss

It's a little from column "A", a little from column "B"; I started looking for some compact 116BCD rings that were suitably inexpensive. Being unable to find any, I realized that I already owned a set of 110 BCD rings in exactly the sizes I wanted. Since they were nice enough to use and rough enough to risk on a foolish venture, the idea was born!

I considered whether or not to add the countersinking at the edge of the newly-enlarged holes. I don't feel like the large chainring would have enough meat left, but I might countersink the holes on the back of the small chainring (especially if they give me any clearance issues back there).

I haven't gotten a chance to mount them up and use them yet, but I'm looking forward to it. I think they will probably hold up just fine due to friction taking a portion of the load that would otherwise be borne by shear strength of the bolts and bolt-holes (bolt-ovals?). I'll try 'em out on the trainer well before spring comes!

If I had a nice drill press at my disposal, I think the Origin-8 110/130 "universal" chainring would be a great candidate for a slightly more sophisticated version of this procedure. They've got tons of extra aluminum in the region where one would be cutting and drilling.

unworthy1

Since you "love to tinker" you deserve a nice drill press...go reward yourself.

Alan Edwards

If you get the 110/130 you can make your own holes and flats, when your done no one will know they weren't new.

MrEss

I had the chance to install these cranks last night; they rode just fine for a couple miles home from the bike shop. Friction did not help much to hold the chainrings in place: the large ring slipped a bit backwards relative to the crankarm and small ring. It seems to have found its home once the the bolt hit the edge of the hole, though.

Still hoping this'll have decent reliability, but I'll be checking it carefully from time to time. If this were fixed-gear, I think it wouldn't last at all because of the back-and-forth rocking of the large chainring. (If I were really concerned about it, some longer chainring nuts would help fix the big ring in place.)

753proguy

I also like the Victory cranks (in particular, because there was a (rare) 175 mm long version of it for ATB use that can be used on a road bike, too, of course, and I'm a 175 mm user).

Miche makes a 116 BCD five-arm 'junior' crankset, but so far I haven't been able to find a good source for just the rings, plus they don't go any larger than 48 teeth, and Miche also told me that the rings are a fairly low-strength alloy, as they are designed for 'kids, not adults....'

753proguy

I just find NOS rings. NOS Campagnolo chainrings for 116 cranks are out there, but the smaller ones are not cheap. 35 is the min. size for that bolt pattern, so you can do a 35-50, for example, and you will see 35, 36, 42, 50, 52, and 53 available, typically. Some sizes were never made, as these were mid-range cranksets. Only the 35 and 36 are getting expensive, so far - perhaps $50-60 each, NOS. The others tend to sell for about $20-40 each, NOS. Almost all of those cranksets were 42/52 or 42/53, originally....

notenoughdaylig 

I'm considering this hack. Anyone else try it? Any long term success?

echo victor 

I asked about this a year ago and got some suggestions, including modifying a 118 BCD ring (which would be a smaller change) - credit to @John E. https://www.bikeforums.net/classic-vi...miche-nos.html

I ended up finding an old stock ring. I'd still like to find a source for reasonably priced alternative 116 rings. Maybe some LBS can order the Miche rings at a reasonable price, but I haven't found one yet.

crank_addict

hehe- Jeff, you are too humble. In other words, do it and toss it in the next round of B.O.C.. That was back in 2012. Curious if it survived.

2017 yeehaw- This chopped, drilled and tapped mash is going on a mini LeMond



Along with a Suntour and BMX Protech ringy dingy drilled

Vintage Raleigh

I see a bicycle and rider not a shamrock (in your quote)

davester

In looking for 116 BCD chainrings for a friend of mine, I happened onto a Czech company that appears to make them to order. They are here, about halfway down the page: https://www.gebhardt.cz/cs/silnice-c...odniky-a-kryty

They are marketed in England through: https://www.soniccycles.co.uk/gebhardt.php
and were reviewed here: https://roadcyclinguk.com/gear/bkool...irst-look.html
He bought one of these through Hilary Stone so I didn't continue this research and I haven't tried to buy directly from Gebhardt or Sonic. Worth checking out though.

echo victor 

Haha, yes, that is a bicycle and rider - but it's latte art rather than a Guinness. Since I know there are a few folks out there who do Guinness art, if I find someone who can do something similar in a Guinness instead of coffee, then I'll change it up - that's what my sig means.

This link doesn't go where I expect. I think the reason is that roadcyclinguk.com uses a web design technique that constantly loads new content as you scroll down, and when you have reached the new content it updates the address in the bar (as a web guy, I understand why people do it, but I still don't like the technique - it can lead to grabbing unintended links).

davester

Try this: https://roadcyclinguk.com/gear/gebhardt-chainrings.html