This is perplexing me. I was wondering if using a multi-speed chain (meant
for shifting) on a single-speed cog tooth profile might me the issue. I'm
not sure it is, but White Industries does say that chain selection is
critical. Without doing my own mental deep dive into the specifics of your
configuration, you might want to look at the following blurbs from the W.I.
website.
On some freewheels they say they have to machine nothes/troughs into the
central part of the freewheel housing, between the teeth, to allow certain
chains to engage fully, without riding up. In other cases, they cannot add
that notch. In BOTH cases, only certain chain profiles will work. Kinda
sounds related to the problem you're experiencing:
Note: All freewheels can use either 3/32” or ⅛” chains except 16T ENO
single and all DOS ENO double freewheels (see FAQ below)
FAQ
- Why can’t I run an ⅛” chain on the 16T freewheel?
-
- Because of the size of the driver and the bearings inside the gear,
we are limited in how small we can make the diameter of the base of the
gear. On the 16T you’ll notice a groove machined on the base next to the
teeth which is needed to clear even a 3/32” chain. For an ⅛” chain that
groove would need to be a bit deeper to allow the chain to fully seat
down
on the teeth but we can’t make the groove deeper without sacrificing the
strength of the gear. Running an ⅛” chain will prematurely wear out the
chain and gear.
- Why can’t I run an ⅛” chain on DOS freewheel?
- Because there’s not enough room in between the teeth for the wider
⅛” chains
On Thursday, September 26, 2024 at 6:22:25 PM UTC-6 Brent Knepper wrote:
> hey Bill I am curious if you've ruled out chain problems sans any
> derailleur/tensioner? like have you seen if you experience the chain
> wanting to jump in a traditional singlespeed configuration where there is
> no derailleur/tensioner, and instead the chain is tensioned by pulling the
> wheel back in the track dropouts? perhaps also 2 or 3 variations of the
> amount of slack in the chain's tension for observation's sake
>
> I would be inclined to try that as like a control group- maybe you already
> have, in which case definitely get a fancy purple ano part ˘ᵕ˘
>
> -bk en ny
>
> On Thursday, September 26, 2024 at 7:53:32 PM UTC-4 TP H wrote:
>
>> And your chainline is straight and not at an angle that would make it
>> want to roll off the freewheel I assume?
>>
>> On Thursday, September 26, 2024 at 3:17:34 PM UTC-7 Bill Lindsay wrote:
>>
>>> My first freewheel was a brand-new DOS ENO 16/19 and that was super bad
>>> in the stand with respect to wanting to climb up off the teeth.
>>>
>>> I've got lots of freewheels to experiment with, so that'll be on the
>>> list.
>>>
>>> On Thursday, September 26, 2024 at 2:57:36 PM UTC-7 Dan wrote:
>>>
>>>>
>>>> Have you been reading Bike Snob? He had the same skipping issue, and it
>>>> boiled down to a worn freewheel. It went away when the freewheel was
>>>> replaced.
>>>> On Friday 27 September 2024 at 04:24:29 UTC+9:30 Bill Lindsay wrote:
>>>>
>>>>> My first instantiation of my 58cm RoadUno was as a 14-speed, as
>>>>> immortalized in Will's email update. I used my wheel set which has a
>>>>> customized 120mm O.L.D. cassette hub which fits 7 cogs from a 9 speed
>>>>> cassette, updated with 10-speed spacers on what was traditionally a
>>>>> 5-speed
>>>>> spaced rear hub. Naturally we call it 7of9with10on5.
>>>>>
>>>>> I had it set up that way for a Mount Diablo Summit, and having done
>>>>> that, I wanted to reconfigure it with the stock wheels for normal city
>>>>> use.
>>>>> I put the stock Saint Jump wheels on there, with a White Industries
>>>>> freewheel, using my Suntour rear derailleur as a tensioner.
>>>>>
>>>>> Pics prove it:
>>>>> https://flickr.com/photos/45758191@N04/54022678302/in/dateposted/
>>>>>
>>>>> Problem was that in the stand, the chain was wanting to rise off the
>>>>> cog on my brand new DOS ENO freewheel. It was worse on the 19 than the
>>>>> 16,
>>>>> but clearly it wanted to rise off on both of them just pedaling. Weird.
>>>>> I
>>>>> attributed it in part to the goopy factory lube on a brand-new SRAM 870
>>>>> chain, and lubed it up and went to bed. In the morning, I tried it out
>>>>> in
>>>>> the stand again and it was still riding up the cog. I went into my
>>>>> freewheel box and found a USED White Industries single freewheel, 18T,
>>>>> and
>>>>> fired that on. In the stand, that was perfecto, and that's what is in
>>>>> the
>>>>> photograph linked above.
>>>>>
>>>>> I rode down the hill that night to the local family grocery store for
>>>>> cilantro and few mushrooms for a soup. Turning back up the hill,
>>>>> DISASTER.
>>>>> Under load, the same riding up and skipping was happening. I took the
>>>>> most shallow slope back up the 400ft hill to my house, and put the bike
>>>>> up
>>>>> in the stand.
>>>>>
>>>>> I returned the 10-speed spaced chain on there, that I had been using
>>>>> with my 7of9with10on5 configuration, and rode that around the block.
>>>>> Same
>>>>> skipping under load.
>>>>>
>>>>> I called it a failure and put the 7speed rear wheel back on, which is
>>>>> still perfecto.
>>>>>
>>>>> My top hypothesis is that in a tensioner configuration, the system
>>>>> wants more tension from the tensioner than my 35 year old Suntour RD is
>>>>> providing. I may experiment with shortening the chain to the minimum
>>>>> length for the two-speed configuration. Some Suntour Rear Derailleurs
>>>>> have
>>>>> two different holes for the spring, so one can effectively make the
>>>>> spring
>>>>> a little stronger. That would be experiment #2. Finally, I may borrow
>>>>> the
>>>>> Paul Melvin from my 3x1 Romulus, to see if that's a far better tensioner.
>>>>> That Romulus 3x1 drivetrain has been perfect. For now it's a two speed,
>>>>> but it is running on the 18T cog of a 7sp cassette.
>>>>>
>>>>> Maybe this is all just the universe telling me to buy a purple
>>>>> anodized Melvin?
>>>>>
>>>>> Bill Lindsay
>>>>> El Cerrito, CA
>>>>>
>>>>
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