Wheelbuilding assistance please
02-23-10 | 10:01 AM
#1
Thread Starter
Sensible shoes.
Joined: Aug 2005
Posts: 8,798
Likes: 0
From: St. Paul,MN
Bikes: A few.
Wheelbuilding assistance please
A few questions as I haven't built a set in a while...
Good online spoke calculator with a modern rim/hub database?
Seems the DT Swiss one now restricts you to DT brand hubs whereas they used to have pretty much everything. Really, I'm not at all amused by that.
Next, I can't find much advice on running wide rims. Is there a magic ratio? Sheldon, Schwalbe, Sun, etc all have varying advice but suggest my idea is ok.
I'd like to build two 26" wheelsets with 31 and 34 mm Sun rims. They would probably have ~2.1" tires but the ability to run tires as narrow as 1.5" would be nice, if not necessary. I've decided on robust DH rims since the potholes are cracking my nice, light, DT rear rim (it was a stretch under my Clydesdale caboose).
Any help appreciated.
Good online spoke calculator with a modern rim/hub database?
Seems the DT Swiss one now restricts you to DT brand hubs whereas they used to have pretty much everything. Really, I'm not at all amused by that.
Next, I can't find much advice on running wide rims. Is there a magic ratio? Sheldon, Schwalbe, Sun, etc all have varying advice but suggest my idea is ok.
I'd like to build two 26" wheelsets with 31 and 34 mm Sun rims. They would probably have ~2.1" tires but the ability to run tires as narrow as 1.5" would be nice, if not necessary. I've decided on robust DH rims since the potholes are cracking my nice, light, DT rear rim (it was a stretch under my Clydesdale caboose).
Any help appreciated.
02-23-10 | 10:26 AM
#2
Senior Member
Joined: May 2004
Posts: 12,103
Likes: 96
From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
Search for "SpoCalc". It's a .xls (spreadsheet) file with most rim and hub combinations available. I have a link at home for another web-based program that a BF member created based on info from various calculators. I still find SpoCalc easier to use but the web-based program has more rim and hub info. You might be able to find it by searching or I can post the link when I get home. SpoCalc could use an update.
If Sheldon, Schwalbe, and Sun all agree that your tire and rim combinations will work, I'd feel pretty secure with the choice.
If Sheldon, Schwalbe, and Sun all agree that your tire and rim combinations will work, I'd feel pretty secure with the choice.
02-23-10 | 10:35 AM
#3
Type 1 Racer
Joined: Apr 2006
Posts: 2,577
Likes: 0
From: Davis, CA
Bikes: A dozen or so.
I use spokecalc and the DT calculator as a check. For DT, you can use any hub you would like... just put "user defined" in the box and fill in the hub dimensions manually. I don't rely on databases for dimensions. Either get it from the manufacturer, a trusted source, or just measure it yourself.
Can't help you much on the subject of rim width...
Can't help you much on the subject of rim width...
02-23-10 | 10:39 AM
#4
I have senior moments...
Joined: Oct 2008
Posts: 2,151
Likes: 2
From: Woodside, CA
Bikes: Many
I just noticed that limited database in the DT calculator the other day...they just being difficult for the competition? Joe--was EDD the other calculator? https://lenni.info/edd/
RogerM's site has a calculator, too https://www.wheelpro.co.uk/wheelbuilding/book.php
RogerM's site has a calculator, too https://www.wheelpro.co.uk/wheelbuilding/book.php
02-23-10 | 11:05 AM
#5
Thread Starter
Sensible shoes.
Joined: Aug 2005
Posts: 8,798
Likes: 0
From: St. Paul,MN
Bikes: A few.
Really, I'm trying to be lazy. The DT calculator WAS great when it had the database. Seems SpokeCalc and most others all use the same antiquated database of hubs.
As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
02-23-10 | 11:11 AM
#6
Senior Member
Joined: Apr 2009
Posts: 39,897
Likes: 3,865
From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
You don't need a database, learn how to measure hubs and rims for yourself. It's easy and in the long run more reliable.
As far as rim width goes I prefer the inner rim width to be between 1/2 and 3/4 of the overall tire width. That's only a guideline, and there's lots of wiggle room. One way is to consider a profile of the mounted tire in cross section. It should resemble an Omega, not an upside down U.
As far as rim width goes I prefer the inner rim width to be between 1/2 and 3/4 of the overall tire width. That's only a guideline, and there's lots of wiggle room. One way is to consider a profile of the mounted tire in cross section. It should resemble an Omega, not an upside down U.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
02-23-10 | 01:02 PM
#7
Great State of Varmint
Joined: Sep 2008
Posts: 7,476
Likes: 18
From: Dante's Third Ring
02-23-10 | 01:10 PM
#8
Peace and bicycle grease!
Joined: Apr 2008
Posts: 285
Likes: 0
From: The Island, CA
Bikes: '85 Schwinn Voyageur, Ross Mt Hood, Rossin, the Nugget
Really, I'm trying to be lazy. The DT calculator WAS great when it had the database. Seems SpokeCalc and most others all use the same antiquated database of hubs.
As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
As to rim width, none of the sources are definitive, rather, they allow one to very reasonably infer I'm in the ballpark. Seems there is plenty of info about going narrower, not wider with rims.
