Thanks for the informative video Danielle, would be interesting if you could make a video comparing SON Speichen rechner vs Monolith CalipERD. Greetings from Croatia
I'd like to take a longer look at the SON, I don't have one in the shop. Incredibly simple design, straightforward way to get NSD measurement (no matter what they say about it being ERD 😜)
I don't quite understand why you add 3mm to the result. Your spokes are 250mm and they measure to the end of the nipple. In my opinion this is the erd point. Why do you think you only measure the nsd with the spokes instead of erd? Thank you for your support. Love from Holland
The homemade versions were measured to be 250mm from the base of the lip on the nipple (the nipple seat) - I had made them to work like the Rim Rods. I just COULD have made them to measure ERD if I had set the length differently. Since they were just an example, I didn't want to make any more 😁
ERD is not a fixed point but “relative”. This is why it is named ERD “effective” rim diameter. Which nipple used will “effect” the diameter if you will
I'm just glad we have spoke calculators these days to save us from saying "man my math teacher was right, I should have paid more attention" 😁 As long as you start with good rim and hub measurements, the calculators do all of the complex geometry for us 😅
I'm curious if you ever do the measure the circumference of the rim bed, then divide by pi, then subtract the measured distance to the nipple seat (x2) method? And how that compares to the three in this video? I build a fair number of wheels, but often times it's the same build, so I'm not always measuring ERD evey time, but when I do, I like to do it a couple different ways, if I can, just to make sure I'm on the right track. Also, would you be able to measure the ERD on a built wheel with the calibERD? You can't do that with rim rods, but if you could with the calibERD, that could be quite useful.
I don't in practice, but I did so we can compare: Circumference: 1943 Depth to nipple seat: 13.3 NSD: 591.88 ERD: 594.88 With 595 being the reading on the CalipERD - I'm happy to call that accurate. For your second question, you could probably cheat the CalipERD by using the Enve feelers, butt them right up to the spoke nipple head in the rim, and then subtract the necessary amount based on the spoke nipple in there. I can't see that being as accurate as measuring without the wheel built, but probably accurate enough for a situation where you would need it. This also assumes that the wheel was built with the correct length spoke to not stick through past the slot (interfering with the measurement altogether). Maybe the key would be a feeler that is a tube that fits over the head to get closer to the NSD measurement. 🤷♀️
