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Sun Rim M13II

Old 03-28-23, 10:25 PM
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JochenRindt
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Sun Rim M13II

I have a rear Sun Rim M13II that I bought new in 2005. It's difficult to remember exactly, but I am quite sure its mileage is less than 4k miles. It has a popped spoke. My question is- should I have the spoke replaced on an eighteen year old wheel or should I just buy a new Sun wheel?
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Old 03-28-23, 10:36 PM
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Depends on a bunch of details.

Are you doing the work?
If paying, how much, vs. how much for a new wheel?
Is the rim OK, ie. little brake crack wear, no stress cracks at spoke holes, no dents, etc?

Comparable quality replacement wheel?

As a rule, I generally replace spokes, and think replacement after the third, or when the interval between spoke breaks becomes too short.
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Old 03-28-23, 10:43 PM
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Originally Posted by FBinNY View Post
Depends on a bunch of details.

Are you doing the work?
If paying, how much, vs. how much for a new wheel?
Is the rim OK, ie. little brake crack wear, no stress cracks at spoke holes, no dents, etc?

Comparable quality replacement wheel?

As a rule, I generally replace spokes, and think replacement after the third, or when the interval between spoke breaks becomes too short.
No, I wouldn't be doing the work myself. The price for a new Wheel Master Sun Rim M13ii is $82. The old (2005) Sun Rim M13ii appears to be okay in terms of cracks/dents. My reasoning for buying a new one was just not to have to worry about some other problem developing with the old wheel.
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Old 03-28-23, 11:01 PM
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Originally Posted by JochenRindt View Post
I have a rear Sun Rim M13II that I bought new in 2005...
Sounds like one of mine! I was really satisfied with my Sun Rim machine built wheel set. I don't remember if it was a Wheel Master or a ChiCom/Ebay purchase. After 8 years slowly spokes on the rear wheel were popping off at the neck. On close examination I found the spokes to be of a diameter closer to 15ga rather then the 14ga I expected. After popping four spokes I decided to just replace all the spokes with 14ga Sapim spokes. It was easy. It has been well worth saving the Sun Rims for sure...

Best supplier I have used recently: https://www.bikehubstore.com/category-s/300.htm
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Old 03-28-23, 11:43 PM
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Originally Posted by JochenRindt View Post
No, I wouldn't be doing the work myself. The price for a new Wheel Master Sun Rim M13ii is $82. The old (2005) Sun Rim M13ii appears to be okay in terms of cracks/dents. My reasoning for buying a new one was just not to have to worry about some other problem developing with the old wheel.
Unless you have a specific reason to expect a problem, this is needless worry.

In any case it's a question of how much peace of mind is worth, so start by getting a quote for the repair.

I suspect that you'll be deciding whether it's worth a $50-60 difference, which IMO is too much. But it's not my bike.
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Old 03-29-23, 01:33 AM
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I'd order 3 spokes of the correct length of the side that broke.
297mm for DS 298mm for NDS.
IF you use all 3, then consider a new wheel or buy the remaining spokes and swap one at a time.
Run spokes up to the 1st thread of a new nipple and then take the wheel to the shop for the final tensioning/truing if you aren't comfortable.
Use new nipples. It makes life considerably easier.
I used 14/15 DB on the DS rear and 15/16 DB on the rest. They do fit a bit sloppy in the 2.6mm holes, but I've used them over 10 years.

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Old 03-29-23, 11:06 PM
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Originally Posted by JochenRindt View Post
The price for a new Wheel Master Sun Rim M13ii is $82. The old (2005).
The price for just the rim at Carson City is about half that.

It's very easy to build a good wheel with these rims. It's my go-to.
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Old 03-30-23, 02:24 PM
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Originally Posted by JochenRindt View Post
I have a rear Sun Rim M13II that I bought new in 2005. It's difficult to remember exactly, but I am quite sure its mileage is less than 4k miles. It has a popped spoke. My question is- should I have the spoke replaced on an eighteen year old wheel or should I just buy a new Sun wheel?
4K miles is less than half a year for me, and my current wheels have nearly 75K miles on them so I really can't relate to your question. As to a single broken spoke, replace it, turn up the tension so it roughly matches the rest of the spokesand I bet the wheel will be very close to round and true. $80 or a $2 repair? I don't think so.
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Old 03-30-23, 02:29 PM
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Where I work that spoke replacement would cost just under $40. About half of the complete replacement wheel. So for those added $42 above a repair one gets unworn bearings, all fresh spokes and often better spoke tension consistency. But if one did replace the complete wheel the old wheel can become the back up wheel and/or the one that you learn how to do this stuff on your own. The value of that education is, IMO, worth far more than the mere $42.

But before deciding I would want to check out the bearing condition. If the cones were pitted I would side on the replacement wheel choice. If this hub is a freehub design then those bearings should also be part of the consideration. Andy
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Old 03-30-23, 02:42 PM
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Originally Posted by Bill Kapaun View Post
I'd order 3 spokes of the correct length of the side that broke.
297mm for DS 298mm for NDS.
IF you use all 3, then consider a new wheel or buy the remaining spokes and swap one at a time.
Run spokes up to the 1st thread of a new nipple and then take the wheel to the shop for the final tensioning/truing if you aren't comfortable.
Use new nipples. It makes life considerably easier.
I used 14/15 DB on the DS rear and 15/16 DB on the rest. They do fit a bit sloppy in the 2.6mm holes, but I've used them over 10 years.
er.... AFAIK spoke length will depend on the specific hub
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Old 03-30-23, 02:54 PM
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Originally Posted by squirtdad View Post
er.... AFAIK spoke length will depend on the specific hub
True Little Beaver. What is so different about the OP's hub and MY hub?
So, what spoke length would you guess?
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Old 03-30-23, 03:08 PM
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Originally Posted by Bill Kapaun View Post
True Little Beaver. What is so different about the OP's hub and MY hub?
So, what spoke length would you guess?
I don't know what hub OP has as all that has been specified was the rim, so I couldn't guess on the difference between your hub and OP's if i had the hub info I would use one of the calculators to get spoke info

I have built enough wheels, and have seen spoke length vary between different hubs

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Old 03-30-23, 04:22 PM
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a new replacement rim, unlaced, runs 40 to 70 bucks on Ebay... Black rims are about $10 cheaper than Alu finishes.

spokes are under $2 each.

the spoke length change from a low flange hub to a high flange hub is about 1mm.
spokes are sold, pre-cut, in TWO millimeter increments.
how far is it to your nearest spoke cutting equipped shop?

i'll assume that a drive side spoke popped.
you'll need a cassette removal socket to access the broken spoke hole.. $15.
get a couple spokes of each length Bill listed...

Or let a shop deal with it .They can quickly determine the condition of your rim...

your choices.
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Old 03-30-23, 05:22 PM
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Originally Posted by squirtdad View Post
I don't know what hub OP has as all that has been specified was the rim, so I couldn't guess on the difference between your hub and OP's if i had the hub info I would use one of the calculators to get spoke info

I have built enough wheels, and have seen spoke length vary between different hubs

Little Beaver out Big Chief
The difference in spoke length caused by the vast majority of rear hubs is insignificant. Just pick a bunch of different rear hubs from the era of the OP's bike and run the numbers in your spoke calculator.
His hub would have to deviate considerably from the norm for the lengths I quoted to NOT WORK well.
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