Kontact

I apparently didn't ask correctly:

What model and year Campy crank do you have that you want to size the spindle for? This information is required for spindle sizing.

What model and year Lynskey do you have coming? This information is required to determine if it is even compatible with your crank.

shelbyfv

Sorry, not on FB. But yes, my "intellect" is apparently superior. as is my knowledge of bikes. I'm not the one screwing up every project I tackle. As to what to do in the future, if you need a double, get one. The swap will be much easier with a modern BB. I might remind you that you are the guy who seems to be unable to do anything bike related w/o asking for help, yet gets agitated when folks who actually know stuff question your lame plans.

SoSmellyAir

Does this unspecified Campagnolo 2X crank allow chain rings to be mounted on both sides of the spider (i.e., the 5-arm star)? If so, do you plan to mount the chain ring on the inside or outside?

When I went 1x on my hybrid, which came with a square tapered bottom bracket, I just installed the desired crank and chain ring on the stock bottom bracket, shifted the chain until it was parallel to the frame, then used the known cog spacing of the cassette to gauge how much difference for the spindle length of the new bottom bracket. Full process detailed here (starting at post #17): Converting Trek FX2 to 1x - Bike Forums

Please note that this method may change your Q-factor by a few millimeters.

PromptCritical 

I have several Campy cranks. All square taper in 2X and 3X. I'm hoping to use a Campagnolo Centaur Carbon Square Taper Crank, but I may use another one. Yes, all the cranks I am considering are traditional 5-bolt Campy road cranks (I thought about using one of my track cranks, but the bolt spacing is too large for a smaller chainwheel. If I use the crank as a 1X, I will mount the chainwheel on the outside. The frame is a Lynskey GR300. Brand new (arriving next week).

I'm not asking which square taper spindle to use, but how to determine which to use. I think I'll have to take a best guess and mount one of the spindles I have and iterate from there.

That's a good thread. Thanks. Yes, I'm wondering about the Q-factor.

Thanks to both for your help.

maddog34

iI'll just drop this here... it's important information, and should be added to the thread... i hate seeing anyone getting hurt.

https://2.bp.blogspot.com/_V54WWNeyyp..._2216906_n.jpg

the hollow two piece spindles have been known to snap too.... especially when used off-pavement.

did campy ever recall any of them?
asking for a confused campy owner.

PromptCritical 

I couldn't tell from your thread whether you were able to use a standard chainwheel or had to use a wide-narrow-wide chainwheel.

I've recently converted a different bike to a 1X and had to use a wide-narrow-wide chainring even though I left the front derailleur on for a bit during testing.

Nothing like jumping in to a conversion to learn a bunch!

Kontact

You asked a question and finally provided enough information for an answer.

Campy uses a handful of very specific spindle lengths. Unlike Shimano, you can't just add 2mm by selecting another size. You can look up what crank uses what spindle length in databases like Velobase. In this case, the road version of Centaur double crank uses a 111mm ISO BB spindle. Spacing between rings is 5mm, so if you use the stock BB length your ring will be off 2.5mm in or out depending on where you mount it - in our out. You could also mount the ring on the inside and use the 115mm BB available for the Centaur triple road crank, which would bump the inner ring over 2mm to centerline. But it would make your Q factor wider for no real gain. 111 with outer ring placement will look better and work as well.

Your frame comes with a road standard BSA 68 threaded BB. Campy BBs come in BSA and Italian.

PromptCritical 

Thank you.

JohnDThompson 

Another option to consider is a Phil bottom bracket that allows about 5mm of lateral adjustment to get proper chainline. Not cheap, but high quality; should last a lifetime.

PromptCritical 

I used one back in the day and it was great. Are they readily available? I've inquired about their hubs and quite a few of them are back ordered.

shelbyfv

Maybe best to ask Phil?

SoSmellyAir

I used a regular chain ring for the FX2 1x conversion and added a chain guide to prevent chain drops. That seldomly-ridden bike only has an 8-speed cassette.

PromptCritical 

I've got a couple of those (seldom ridden bikes)....