HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 4795 posts ] 
Go to page Previous  1 ... 292, 293, 294, 295, 296, 297, 298 ... 320  Next
Author Message
 Post subject: Spoke calculation help.
PostPosted: Sun Sep 22, 2013 1:27 am 
Offline

Joined: Sat Dec 31, 2011 1:17 pm
Posts: 128
Location: Perth, W.A
I have a question which i hope someone can answer.

I am wanting to put new hubs and spokes on my Corima Aero rims. I have used numerous online calculators to determine the correct spoke length but i seem to be getting different answers. I want to use Chris King r45 hubs with Sapim cx ray spokes. I have found online a 50mm wheel set with the same hub and spoke specs and it gives me the spoke length. Can assume that with a 47mm profile i can just take off 3mm from the 50mm measurements and it will work on the 47mm wheels. Am i making any sense? Or even better, if anyone has laced some Corima aero's with different hubs and spokes then i would love to hear from you. I saw on here there was a thread about Corima aeros ERD but nothing about replace hubs and spokes.
Cheers


Top
 Profile  
 
PostPosted: Sun Sep 22, 2013 2:00 am 
Offline

Joined: Tue Jan 22, 2013 6:23 am
Posts: 352
I wouldn't trust just taking off 3mm. The issue lies with rim thickness and the accuracy of how tall the rims really are. I would measure them yourself to find the exact ERD.

how to measure ERD: http://www.youtube.com/watch?v=EoJJI7FRZLk


Top
 Profile  
 
Posted: Sun Sep 22, 2013 2:00 am 


Top
  
 
PostPosted: Sun Sep 22, 2013 5:06 pm 
Offline

Joined: Tue Sep 14, 2010 3:28 pm
Posts: 1402
It's not as simple as just subtracting 3mm from a similar wheel. You should measure the ERD yourself.

Where did you find Corima Rims in the US?


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 12:55 am 
Offline

Joined: Sat Dec 31, 2011 1:17 pm
Posts: 128
Location: Perth, W.A
No, got the wheels in Australia. The more i look online for answers, the more i am discovering that i should just measure everything myself instead of relying on other peoples figures.....call it laziness i suppose.


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 3:13 am 
Offline

Joined: Tue Jan 22, 2013 6:23 am
Posts: 352
sjc166 wrote:
No, got the wheels in Australia. The more i look online for answers, the more i am discovering that i should just measure everything myself instead of relying on other peoples figures.....call it laziness i suppose.



Unfortunately, measuring yourself is going to be the best option.


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 1:06 pm 
Offline

Joined: Wed Mar 17, 2010 12:04 am
Posts: 95
I've decided to get a power meter, and think a power tap G3 is best for me, although I'm now torn on deciding on the right wheel build, to allow for use as a training and racing wheel.

I want something that is light but robust enough for using for training during winter.

I dont think I'm very hard on wheels, and my current training wheels are some (Very) cheap Shimano R501s that only have 24 spokes rear. My 'good' wheels (Easton EA90 SLX) are also 24 spokes on the rear, so I see no reason why 24 spokes isn't sufficient for my attempt at an all purpose wheel?

Any advice on what rim to go with would be good, I like the idea of sticking with something similar to the Easton I already have, so 25 or 27mm in black. Pacenti SL23 or H Plus Archetype?

How have others built their PTs into all purpose wheels, and how successful has it been as an all rounder?

Is it just a case of resigning yourself to replacing a lightweight rim more regularly than you otherwise would on a more robust training wheel? Are the hubs themselves quite robust?

I'm 70kgs.


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 3:25 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1703
Location: Santa Cruz, California, USA
If you get a PT you will want to use it all the time. So it needs to be sturdy like a training wheel. It's not going to be light anyhow as the hub is heavy.

My PT wheel needed to be rebuilt about every 9 months until I got a crank based PM. The rim would crack or too many spokes would break. But this was with an older SL+, which does not have good flange spacing. Supposedly the G3s are better.

I'm 65kg. My PT wheel is 28h and I'd wished that I'd gotten 32h. But like I have posted before I am hard on rear wheels- I do a lot of climbing, lots of steep climbs with low gearing and lots out of the saddle.


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 3:51 pm 
Offline
User avatar

Joined: Sun Nov 06, 2005 7:27 pm
Posts: 303
I posted this is the road forum a while ago and got no responses, so I thought I'd try here.

I have some old Reynolds Stratus 46T, circa 2007, with White Industry 16/20 hubs. I love the hubs, but the rear rim has some slight damage (small dent in the brake track from a pothole or something). What options do I have to replace jsut the rims, besides from Reynolds (assuming they still carry them)? Thanks.

_________________
“If you save your breath I feel a man like you can manage it. And if you don't manage it, you'll die. Only slowly, very slowly old friend.”


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 8:20 pm 
Offline

Joined: Wed Mar 17, 2010 12:04 am
Posts: 95
Thanks Eric.

I've just been to my LBS and they recommended what seems to be the 'go to' choice of a 32 spoke open pro.

Looking at this calculator, with decent spokes it should come out at about 925g.

http://www.wheelbuilder.com/wheel-weigh ... lator.html

Given that my current rear wheel is about 840g its not too bad, going 24 spoke would only save about 40g and at the moment only the 32 hole hubs are in stock, and they'll do it on the cycle to work scheme, so I think the writing is on the wall!!


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 10:38 pm 
Offline
in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 1282
Location: Glermsford, Suffolk U.K
I have built with the SL+ a couple of times and both times I am glad I used a stiffer rim liek the archetype as the custimer hubs were 28 spoke or 24. Even with race spoke the 28 spoke wheel showed flex. The open pro is not a stiff rim but at least you are light but even for you I would want to use something stiffer like the archetype or Kinlin XR-300, these rims are not too heavy either.

I would not want to build a power tap 28H on to an open pro for anyone.

_________________
www.thecycleclinic.co.uk


Top
 Profile  
 
PostPosted: Mon Sep 23, 2013 10:44 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1703
Location: Santa Cruz, California, USA
I am not a big fan of the open pro. I have a number of them (I think 3) crack around the eyelets. They're also kind of flexy but with 32h that's not so much of an issue.
For narrow rims the XR270 is my choice. It weighs the same but is stiffer, making a stronger wheel.

But the SL23 is roughly the same weight and looks like a good rim. I haven't tried them yet but have built some other wide rims and like them.


Top
 Profile  
 
 Post subject: My first wheel build
PostPosted: Tue Sep 24, 2013 1:21 am 
Offline

Joined: Thu Dec 22, 2011 12:39 pm
Posts: 365
Location: DC
In coming weeks I will be building my very first wheel set. I have built multiple bikes for myself and friends and consider myself a detail oriented and proficient mechanic so I figured a wheel set is right up my alley. I will be doing the build at my LBS with some help of course from a good friend. I'll try to update and post photos of the process as I see many nice wheels built up but never the process itself. I weigh anywhere between 158lbs to 165lbs depending on time of the year. I'm more of a "spinner" and don't mash big gears always. Like climbing and am decent at it. Here is what I am going with:

Rims: H Plus Son Archetypes in matte black. 20f / 24r. (yes, i know the finish will wear off :thumbup: )
Hubs: Novatec A291SB SL (front) & Novatec F489SB SL (rear)
Spokes: Sapim Laser (black)
Nipples: Sapim Brass 12mm

Rims are a very popular choice and probably for a reason. Quality seems to be very high, great looks and of course wide rim for a better tire profile and comfort. The wheel set will be ridden on my stiff CAAD8 so the extra comfort will be greatly appreciated!

Hubs should provide a good geometry for the build. The weight and price is right too. Novatec makes OEM hubs for many other companies and this particular set that I chose to use has been used in many successful builds by individuals and small wheel builders.

Spokes should provide the right combination of weight, strength and compliance. Sapim Lasers are essentially CX-Ray's before they get flattened.

Nipples will be brass and not aluminum. The small penalty in weight is worth the peace of mind since the wheels will be ridden in all kinds of weather including rain. This will prevent the nipples from rusting and possibly fusing to the spokes.

Lacing

Front wheel will be laced radially. This should provide enough stiffness and look good. Most modern wheels are laced this way as well.
Rear wheel will be laced 2X on DS and NDS. This seems to be the most effective lacing from my research. Also, my other two wheel sets had the same type of lacing on 20 spoke rear wheels and I cannot report any problems.

Spoke lengths

I used several on line calculators and below are the numbers I came up with. Since Sapim Laser spokes come in odd lengths I will be ordering the following:

Front wheel (20 radial)

Both sides 283.1mm --- ordering 283mm

Rear wheel (24 2X DS and NDS)

NDS 288.8mm --- ordering 289mm
DS 285.2mm --- ordering 285mm

Hubs are already on their way. Should arrive by end of this week. Photos and weights coming. Any tips and suggestions are welcome!

_________________
My Bikes:
BMC SLR01 TeamMachine
Cannondale CAAD8


Top
 Profile  
 
PostPosted: Tue Sep 24, 2013 8:20 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1703
Location: Santa Cruz, California, USA
Use something to keep the Lasers from winding up. Smooth jaw pliers will work.
I bought a twist-resist.

Or you can overshoot and turn the nipple back. Flag some spokes with tape to see how much they twist.


Top
 Profile  
 
PostPosted: Tue Sep 24, 2013 8:23 pm 
Offline

Joined: Thu Dec 22, 2011 12:39 pm
Posts: 365
Location: DC
Thanks for the tip, eric. I have a set of small pliers that may work for this. I'll keep a close eye for when I'm tightening the spokes.

_________________
My Bikes:
BMC SLR01 TeamMachine
Cannondale CAAD8


Top
 Profile  
 
PostPosted: Thu Sep 26, 2013 6:51 am 
Offline

Joined: Tue Jan 22, 2013 6:23 am
Posts: 352
eric wrote:
Use something to keep the Lasers from winding up. Smooth jaw pliers will work.
I bought a twist-resist.

Or you can overshoot and turn the nipple back. Flag some spokes with tape to see how much they twist.


I use a pair RC Car shock shaft pliers to hold the spokes. It works great and the learning curve wasn't too steep.

I have these:
http://www.amainhobbies.com/product_inf ... Qgod4VQA0w


Top
 Profile  
 
Posted: Thu Sep 26, 2013 6:51 am 


Top
  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4795 posts ] 
Go to page Previous  1 ... 292, 293, 294, 295, 296, 297, 298 ... 320  Next


Who is online

Users browsing this forum: mind riot and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Wheelbuilding - Every 5th spoke too short...

in Road

shinkansen

14

1497

Tue Apr 01, 2014 5:00 am

ProEvoSLTeamHighMod View the latest post

There are no new unread posts for this topic. The 'hub help' thread

[ Go to page: 1, 2 ]

in Everything wheels

kavitator

20

869

Wed Mar 05, 2014 7:19 pm

sanrensho View the latest post

There are no new unread posts for this topic. Thread title V2.0

in Test

pam

0

161

Sat Mar 08, 2014 2:38 am

pam View the latest post


It is currently Tue Sep 02, 2014 7:06 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB