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Stack height question

Old 05-15-21, 11:52 AM
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gazman22
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Stack height question

Hello,

just want to confirm the following before I get to far into this. Bike is disassembled.

1. steerer tube is 182mm. Head tube is 145mm. 182-145=37mm available

2. published stack height for purchased headset is 41mm

3. I have measured new headset locknut and it has 7mm of threads.

4. if I am correct, I can use this headset and have 3mm of threads securing the assembly in place.

So, is above correct? And if so is 3mm of bite sufficient? Add a spot of loctite?

thanks in advance,

Gary
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Old 05-15-21, 08:22 PM
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Your math is correct and if your measurements are too then I don't advise this headset use. Typically 4 to 5 threads minimum of engagement are recommended for a threaded fitting. Now you could loose the lock washer and possibly gain another mm. Some of this depends on the steerer's thread condition at the top of it. Sometimes the first couple of threads are not full height. Yes a thread locker application might help. But I would try to source a headset with a lower stack. I've mixed lowers and uppers from different headsets before to get a better fit for the fork. Andy
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Old 05-16-21, 09:44 AM
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Thanks for the reply. I will look to source a headset with a better fit. I do have the old headset for reference.

One follow up question. The headset has sealed bearings and is replacing an caged bearing headset. All the other headsets I have rebuilt were open/caged bearings. Is setting the compression on the headset a similar process? tighten until no feel of play? can sealed bearings take a tighter force?

Thanks,

Gary
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Old 05-16-21, 01:33 PM
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The test for bearing preload is the same for cartridge VS loose bearing headsets. Easy rotation with no slop. I test for slop by applying the ft brake and trying to rock the bike for and aft. Whether the rock is within the cartridge or between the cartridge and the supporting head set parts in not the issue. This added interface might require a tad more preload to keep settled. Work the fine tuning of the final adjustment from slop to tight enough to eliminate slop and no more. Andy
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Old 05-16-21, 03:55 PM
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