I’m not very experienced with using the online spoke calculators (last time I did this was back in the days of having a special TI calculator with an installed program for this).

Need to replace a couple of the drive side spokes on my wheels. They are 2013-era Light Bicycle 29er hookless rims (27W-24D) with an ERD of 592mm according to LB, on DT Swiss 240s 6-bolt hubs.

Does my calculation of 287 for both sides seem correct?

Forgot to add – 32H, 3x lacing.

Would it not just be easier to remove another and measure it? You need to de stress the wheel before bashing in new ones either way.

It would be easier to do that! Unfortunately the wheels are on a spare bike at our holiday home, and I’m hoping to bring the correct spokes with me, replace, and ride over Christmas.

https://spokes-calculator.dtswiss.com/en/calculator

You can pick your DT hubs from the drop down and manually enter the ERD. Looks like 287 is correct.

It would be easier to do that! Unfortunately the wheels are on a spare bike at our holiday home

Ah ok, that makes more sense.

IIRC my lb’s (26ers) were an odd length.
Got them factory built in China on pillar aero x spokes.

When I snapped a few due to a derailleur hitting them, I took it to the LBS but the correct size pillar spokes were going to take a while to get hold of, so I opted to get the wheel rebuilt on DT spokes which were more easily obtainable in the correct size.
Took the opportunity to swap the nipples to black brass rather than ally at the same time.

How many spokes do you need altogether? You could bring a couple of longer and a couple of shorter ones just in case.

Don’t forget that LB do not include the nipple head in their ERD. My calcs say 290mm for the rear wheel.

Freespoke suggests 287mm too but that didn’t account for the erd difference @TrevorB mentions. What is LB short for?

https://kstoerz.com/freespoke/?link=1&e=592&hub=238&n=32&xL=3&xR=3

I think Trevor B is right. Accounting for nipple heads ~2mm each by adding 4mm to the ERD would make it 289mm. I would still be tempted to take a couple of 287-8s and 290-1s just in case.

LB is Light Bicycle