I'm a champion bike mechanic...
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Re: I'm a champion bike mechanic...
Postby blizzard » Sat Jun 08, 2024 2:34 pm
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Re: I'm a champion bike mechanic...
Postby blizzard » Sat Jun 08, 2024 9:44 pm
I used a torque wrench for the first time on the thru axles on my Tarmac, I normally just short 6mm Allen key and do it up almost as tight as I can. The spec is 15nm, using a 150mm torque wrench it got another quarter turn or so to get 14nm and was a fair bit of effort. I can't see how the the ~60mm integrated handles on some bikes can even get close to the correct torque.
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Re: I'm a champion bike mechanic...
Postby stevenaaus » Mon Jun 10, 2024 1:03 am
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Re: I'm a champion bike mechanic...
Postby stevenaaus » Mon Jun 10, 2024 1:05 am
.
Quick release just works doesn't it. (well, mostly)
Thru axles are just another of the myriad problems disc brakes have brought about imho. Group ride discussion yesterday was about nasty thru axle failure.
Add them to hydraulic fluid leaks and (sram) fluid changes, squealing banshees in the rain, slow wheel wheel changes in racing, heavier bikes and wheels, and don't think about changing your stem if you're running internal routing, for dog's sakes. 🫨
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Re: I'm a champion bike mechanic...
Postby blizzard » Mon Jun 10, 2024 9:14 am
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Re: I'm a champion bike mechanic...
Postby warthog1 » Mon Jun 10, 2024 9:38 am
My S5 has CF dropouts. The wheelhub is partially supported by the hanger screws at the top, but not at the bottom, of the dropout. The bottom part has compessed leaving an indentation. When you close the quick release the entire derailleur moves inward toward the wheel due to the indentation below the hanger screws. The hanger needs a significant bend so it will still shift.
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Re: I'm a champion bike mechanic...
Postby jasonc » Mon Jun 10, 2024 9:58 am
I have 3 disc bikes. NONE of them have routing through the headset. It was a requirement.stevenaaus wrote: ↑Mon Jun 10, 2024 1:05 amdon't think about changing your stem if you're running internal routing, for dog's sakes. 🫨
and agree with warthog re quick release. to do it up securely EVERYTHING moves.
ask cervolo owners what they think about quick release drop outs.
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Re: I'm a champion bike mechanic...
Postby Duck! » Mon Jun 10, 2024 11:18 am
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Re: I'm a champion bike mechanic...
Postby CmdrBiggles » Mon Jun 10, 2024 12:46 pm
The Zaskar MTB recently sold had through-axle screw-down-and-tighten QRs; no problem ever with these, and very quick and easy to get the wheel in and out.
'18 GT Zaskar Carbon Comp 9r
2021 Dragon Raptor e-scooter ['Yellow Peril']
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Re: I'm a champion bike mechanic...
Postby robbo mcs » Mon Jun 10, 2024 7:39 pm
That seems like quite a high torque number to me. I had a look at all my TA bikes, and the torque marked on the TA's varies from 5.5 to 8nm on the front and 8 x 11.5nm on the rear. I guess it must vary with manufacturer and materialsblizzard wrote: ↑Sat Jun 08, 2024 9:44 pmDifferent topic, but I imagine a lot of people under tighten their thru axles especially if they have integrated handles.
I used a torque wrench for the first time on the thru axles on my Tarmac, I normally just short 6mm Allen key and do it up almost as tight as I can. The spec is 15nm, using a 150mm torque wrench it got another quarter turn or so to get 14nm and was a fair bit of effort. I can't see how the the ~60mm integrated handles on some bikes can even get close to the correct torque.
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Re: I'm a champion bike mechanic...
Postby blizzard » Mon Jun 10, 2024 8:11 pm
Duck I'm not surprised there is no difference in ride feel, TA and QR are functionally the same in that they are just there to provide clamping force on the hub axles.
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Re: I'm a champion bike mechanic...
Postby P!N20 » Mon Jun 10, 2024 8:20 pm
My understanding is through axles were adopted where disc brakes were used to prevent QR skewers from ejecting out of the fork ends: https://diskbrakesqr.wordpress.com/
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Re: I'm a champion bike mechanic...
Postby Duck! » Mon Jun 10, 2024 9:51 pm
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Re: I'm a champion bike mechanic...
Postby baabaa » Tue Jun 11, 2024 8:32 am
And the for peoples that may have thought they may have an issue with qr, and way before thru axles became yet another new standard, chris king, phil wood and hope ( must be others) offer fun bolt on options to change the quick release skewer to a bolt on set ups which you can snug down each side of the hub (as tight as you like....)
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Re: I'm a champion bike mechanic...
Postby Mr Purple » Tue Jun 11, 2024 9:11 am
QR's always had me a bit worried because it was done by feel. I'm sure it's entirely adequate, but still that would worry me with disc brakes.
I even went to the extent of replacing my RAT (QR thru axle) setup on my Focus with Robert Axle Project thru-axles. So much better, and fixed all my disc rub issues.
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Re: I'm a champion bike mechanic...
Postby antigee » Tue Jun 11, 2024 2:02 pm
https://www.cotic.co.uk/geek/page/archive
"Our ROADHOG forks caused a bit of a stir when they were released to compliment our ROADRAT frame. Why? Well, as you can see from the photo, the disc mount is positioned on the front right of the fork rather than the more usual left rear. As always with Cotic products, there were firm engineering reasons for placing it where it is, and here's the lowdown:
Forces
Axle movement under disc braking is now a fairly well known phenomenon in mountain biking. Basically with the caliper positioned left rear (usual place), and a vertical dropout, there is a reaction of the braking force which tends to push the axle out of the dropout, hence you're relying on the friction of your QR to counteract this rather than a completely mechanical stop. Most manufacturers have moved to a slightly forward facing dropout to counteract this."
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Re: I'm a champion bike mechanic...
Postby jasonc » Tue Jun 11, 2024 7:03 pm
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Re: I'm a champion bike mechanic...
Postby blizzard » Tue Jun 11, 2024 8:23 pm
Got the Nulon grease, it's quite a bit more viscous and stickier than the DT Swiss grease.jasonc wrote: ↑Fri Jun 07, 2024 10:57 amso looking for dt swiss special grease
looks like this has the same specifications
https://www.supercheapauto.com.au/p/nul ... =SCA010708
it's NLGI 2sounds the same as the dt swiss stuffThis lithium base grease with added PTFE (Polytetrafluoroethylene) will coat surfaces to increase performance whilst minimising wear.
It's even stickier than the Weldtite bike grease which is heavier than the DT Swiss stuff.
I would probably try Slickoleum or maybe ask a couple stores what they have for ratchet servicing, because they have to use something.
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Re: I'm a champion bike mechanic...
Postby antigee » Tue Jun 11, 2024 8:58 pm
https://www.bicycles.net.au/forums/view ... e#p1602486
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Re: I'm a champion bike mechanic...
Postby warthog1 » Tue Jun 11, 2024 9:05 pm
I use it for the front wheel bearings on my Patrol. It is quite sticky.blizzard wrote: ↑Tue Jun 11, 2024 8:23 pmGot the Nulon grease, it's quite a bit more viscous and stickier than the DT Swiss grease.jasonc wrote: ↑Fri Jun 07, 2024 10:57 amso looking for dt swiss special grease
looks like this has the same specifications
https://www.supercheapauto.com.au/p/nul ... =SCA010708
it's NLGI 2sounds the same as the dt swiss stuffThis lithium base grease with added PTFE (Polytetrafluoroethylene) will coat surfaces to increase performance whilst minimising wear.
It's even stickier than the Weldtite bike grease which is heavier than the DT Swiss stuff.
I would probably try Slickoleum or maybe ask a couple stores what they have for ratchet servicing, because they have to use something.
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Re: I'm a champion bike mechanic...
Postby P!N20 » Wed Jun 12, 2024 11:41 am
There's a spring inside the mechanism that has a habit of breaking or losing tension. In this unit the spring hadn't broken, but it was folded, so when I tried to bend it back it broke. I managed to cut the spring short and re-bend the end which solved the problem - after much swearing - I'm sure Swiss watches aren't as complicated.
I'm pleased to report the patient is recovering well. With thanks to Jules21 for help and guidance.
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Re: I'm a champion bike mechanic...
Postby Mr Purple » Thu Jun 13, 2024 6:41 pm
Have lost access to the 11 tooth on the rear and can’t seem to index the inner rings.
Any thoughts? Needs a service anyway which is booked, just may limit my climbing this weekend. Probably not a bad thing to be honest!
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Re: I'm a champion bike mechanic...
Postby blizzard » Fri Jun 14, 2024 9:08 am
The stuff that goes wrong with a RD isn't that high, could be a limits set wrong, a bent hanger or somehow you put too much tension on the cable during install that is stopping it from going into the 11.Mr Purple wrote: ↑Thu Jun 13, 2024 6:41 pmI suspect I managed to misalign my RD after snapping the cable with 50km to go in the Brissie to Bay and finishing largely cross chained in 11th.
Have lost access to the 11 tooth on the rear and can’t seem to index the inner rings.
Any thoughts? Needs a service anyway which is booked, just may limit my climbing this weekend. Probably not a bad thing to be honest!
Seeing you can't index it I would think it's most likely the hanger.
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Re: I'm a champion bike mechanic...
Postby Mr Purple » Fri Jun 14, 2024 10:13 am
Haven't touched the limit, and loosened the cable completely and still can't get the 11.blizzard wrote: ↑Fri Jun 14, 2024 9:08 amThe stuff that goes wrong with a RD isn't that high, could be a limits set wrong, a bent hanger or somehow you put too much tension on the cable during install that is stopping it from going into the 11.
Seeing you can't index it I would think it's most likely the hanger.
Given how I abused it (500W+ climbing efforts crosschained due to the snapped cable) and the symptoms it's got to be a bent hanger. Would mean it's angled in slightly so can't get the 11, and can't properly index the inner gears because the effective angle would be greater on that side.
Having said that it's pretty rideable provided I steer clear of Cootha Back this weekend and getting serviced next week. So I figure I'd only make it worse trying to fix it without an RD alignment tool.
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Re: I'm a champion bike mechanic...
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