Spocalc measurements

Gene Tolli said:

The front hub will be a Campy NR high-flange, the rear an IRO track hub,
and the rims 36-hole Velocity Razors laced 3 cross. Using the above
parts, Spocalc lists the resulting spoke lengths as 289.1 front, 289.7
rear.

My questions:

Are these numbers right (in other words, have I used Spocalc correctly)?

That's what I get, and Spocalc has been completely reliable for me.
Either you've got it right or we're both complete, raving lunatics who
believe the words that magically appear on the biege boxes that we keep
on our desks.

Quoted message said:

Can I simply use 290s/brass nipples front & rear?

Yep. Spokes can be up to 2mm off- shorter or longer, and the wheel will
still be serviceable, but not ideal.

As to brand- I'm bi-spoke-ual. I'll build with DT or Wheelsmith and
I've gotten excellent results with both.

Jeff

Gene Tolli said:

I'm converting a bike to single-speed, using as many of the existing
components as possible. I'm using the lite version of Spocalc to
calculate the correct spoke lengths, and was hoping someone could
validate my measurements.

The front hub will be a Campy NR high-flange, the rear an IRO track hub,
and the rims 36-hole Velocity Razors laced 3 cross. Using the above
parts, Spocalc lists the resulting spoke lengths as 289.1 front, 289.7
rear.

My questions:

Are these numbers right (in other words, have I used Spocalc correctly)?

Can I simply use 290s/brass nipples front & rear?

Is there still a discrepancy between corresponding DT and Wheelsmith
spoke lengths? Its been a two years since I built any wheels, but I
vaguely remember having to add a small amount (1-2mm) to the labeled
spoke length from one of these manufacturers to get the corresponding
length from the other.

Finally: DT vs. Wheelsmith - any reason to choose one over the other?

Thanks in advance.

Regards,
Gene Tolli

I would use 288 mm spokes for those combinations.
My first choice is Sapim Race, then DT Competition 14/15 DB. Wheelsmith isn't as durable as either in my experience.

daveornee said:

Gene Tolli said:

I'm converting a bike to single-speed, using as many of the existing
components as possible. I'm using the lite version of Spocalc to
calculate the correct spoke lengths, and was hoping someone could
validate my measurements.

The front hub will be a Campy NR high-flange, the rear an IRO track
hub,
and the rims 36-hole Velocity Razors laced 3 cross. Using the above
parts, Spocalc lists the resulting spoke lengths as 289.1 front, 289.7
rear.

My questions:

Are these numbers right (in other words, have I used Spocalc
correctly)?

Can I simply use 290s/brass nipples front & rear?

Is there still a discrepancy between corresponding DT and Wheelsmith
spoke lengths? Its been a two years since I built any wheels, but I
vaguely remember having to add a small amount (1-2mm) to the labeled
spoke length from one of these manufacturers to get the corresponding
length from the other.

Finally: DT vs. Wheelsmith - any reason to choose one over the other?

Thanks in advance.

Regards,
Gene Tolli

I would use 288 mm spokes for those combinations.
My first choice is Sapim Race, then DT Competition 14/15 DB.
Wheelsmith isn't as durable as either in my experience.

Dave,

Thanks for the reply. Out of curiosity, why would you opt for the
shorter length?

--Gene

quote='Gene Tolli'daveornee said:

Gene Tolli said:

I'm converting a bike to single-speed, using as many of the existing
components as possible. I'm using the lite version of Spocalc to
calculate the correct spoke lengths, and was hoping someone could
validate my measurements.

The front hub will be a Campy NR high-flange, the rear an IRO track
hub,
and the rims 36-hole Velocity Razors laced 3 cross. Using the above
parts, Spocalc lists the resulting spoke lengths as 289.1 front, 289.7
rear.

My questions:

Are these numbers right (in other words, have I used Spocalc
correctly)?

Can I simply use 290s/brass nipples front & rear?

Is there still a discrepancy between corresponding DT and Wheelsmith
spoke lengths? Its been a two years since I built any wheels, but I
vaguely remember having to add a small amount (1-2mm) to the labeled
spoke length from one of these manufacturers to get the corresponding
length from the other.

Finally: DT vs. Wheelsmith - any reason to choose one over the other?

Thanks in advance.

Regards,
Gene Tolli

I would use 288 mm spokes for those combinations.
My first choice is Sapim Race, then DT Competition 14/15 DB.
Wheelsmith isn't as durable as either in my experience.

Dave,

Thanks for the reply. Out of curiosity, why would you opt for the
shorter length?

--Gene[/QUOTE]
288 mm spokes will not bottom out on the treads and will have sufficient length to make full engagement of threads when the wheels are finished at proper tension, spoke lines corrected, and stress relieved.
290 mm spokes will protrude at the end of the nipples, and depending on the nipples may bottom the spoke threads in the nipples. You won't know the details until you are finished or nearly finished with the wheels.

On Sat, 29 Oct 2005 10:29:03 -0500, Gene Tolli <[email hidden]>

Quoted message said:

daveornee wrote:

Quoted message said:

Quoted message said:

I would use 288 mm spokes for those combinations.
My first choice is Sapim Race, then DT Competition 14/15 DB.
Wheelsmith isn't as durable as either in my experience.

Quoted message said:

Dave,

Thanks for the reply. Out of curiosity, why would you opt for the
shorter length?

The half gram wight saving per wheel, and all rotating mass too! The bike
will feel much more responsive!

Jasper (Tongue firmly embedded in cheek)

Jasper Janssen said:

On Sat, 29 Oct 2005 10:29:03 -0500, Gene Tolli <[email hidden]>

Quoted message said:

daveornee wrote:

Quoted message said:

Quoted message said:

I would use 288 mm spokes for those combinations.
My first choice is Sapim Race, then DT Competition 14/15 DB.
Wheelsmith isn't as durable as either in my experience.

Quoted message said:

Dave,

Thanks for the reply. Out of curiosity, why would you opt for the
shorter length?

The half gram wight saving per wheel, and all rotating mass too! The bike
will feel much more responsive!

Jasper (Tongue firmly embedded in cheek)

It'll also compensate for spoke stretch.

Jeff (Also tongue in cheek... although that's a really distubing
visual)