when I rode with my chum, it soon became clear that he changed gear at least ten times more often than I did. I guess that is what many years of riding a SA 5s hub does for you. To give you some idea, I worked out that you could nigh-on replicate the gear ratios using a derailleur system, but even I was surprised by the result.
If you started with a 7s 13-28T freewheel and simply omitted 3rd and 5th, you would be pretty close. Because the middle gear is
arguably doing the work of three, gear changes on a flattish road with a SA 5s hub can be few and far between.
Search found 44394 matches
- 28 Mar 2024, 6:07pm
- Forum: Bikes & Bits – Technical section
- Topic: Tiagra ST-4703 Shifter Not Working
- Replies: 19
- Views: 566
- 28 Mar 2024, 1:29pm
- Forum: Bikes & Bits – Technical section
- Topic: Tiagra ST-4703 Shifter Not Working
- Replies: 19
- Views: 566
Re: Tiagra ST-4703 Shifter Not Working
things can wear out or break depending on the exact model but by far the most common faults are dried grease and broken cables. Very often shifters don't survive an episode of broken cables, because they get damaged when the broken bits are removed. Needless to say you don't have the same problem if the cable is largely outside the shifter. One of my chums had repeated problems with broken cables inside STIs on his commuting machine. Riding with him, I soon established the reason; he was wont to do many more gear changes than most people,and his gear cables wouldn't last 9 months without fatiguing and breaking. Using him as a guinea pig, I was able to establish that the life expectancy of cables inside STI shifters is typically about 150000 shifts. By routinely changing the cables at about 125000 shifts my chum's problem was almost completely cured.Cyclothesist wrote: ↑28 Mar 2024, 11:05am.... The only trouble I've had is fishing broken gear cable strands out when I've been tardy in replacing them.
Maybe I've been lucky?
- 28 Mar 2024, 11:18am
- Forum: Bikes & Bits – Technical section
- Topic: M2.5 bolt
- Replies: 30
- Views: 1036
Re: M2.5 bolt
FWIW a drop of loctite on these screws never hurts.
- 28 Mar 2024, 10:23am
- Forum: Bikes & Bits – Technical section
- Topic: Noisy freehub - quieten with grease?
- Replies: 35
- Views: 1526
Re: Noisy freehub - quieten with grease?
that is pretty much what I'd do anyway tbh
- 28 Mar 2024, 10:11am
- Forum: Bikes & Bits – Technical section
- Topic: Tiagra ST-4703 Shifter Not Working
- Replies: 19
- Views: 566
Re: Tiagra ST-4703 Shifter Not Working
I decided long ago that I preferred not to have STIs and that 'old-fashioned' they might be, but separate gear and brake levers had numerous advantages for me. Accordingly I would take the failure of my left shifter as nature's way of persuading me to do things differently.
- 27 Mar 2024, 7:51pm
- Forum: Bikes & Bits – Technical section
- Topic: Custom Storage
- Replies: 15
- Views: 633
Re: Custom Storage
I would probably make something like a C shape in timber and leave it on the garage floor so that you would have to drive over the long side of the 'C' to get close to the bike. The two short sides of the 'C' shape would hold it away from the end wall. If 4x2" timber is used, you can make it so that it would only be possible to hit a parked bike if you drove over a 4" piece of timber first.
- 27 Mar 2024, 7:00pm
- Forum: Bikes & Bits – Technical section
- Topic: Noisy freehub - quieten with grease?
- Replies: 35
- Views: 1526
Re: Noisy freehub - quieten with grease?
what kind of cycle bell is used for the whatsapp sound? It ought to be possible to differentiate the sound of your bell from this...
- 27 Mar 2024, 6:14pm
- Forum: Bikes & Bits – Technical section
- Topic: Front wheel 9mm across flats into 10mm drop outs
- Replies: 4
- Views: 222
Re: Front wheel 9mm across flats into 10mm drop outs
if the front wheel is properly tightened the 0.5mm gap shouldn't matter. However, this is presumably a motor wheel and there is wheel retention to consider too. All front wheels (on bikes where it might be possible to ride them with the wheels not properly tightened) are now meant to have some form of secondary wheel retention, so that even a loose front wheel can't simply drop out of the bike over a bump.
Now it is entirely up to you if you have a secondary wheel retention system or not but should you ever sell a bike on having disabled it, there could be unfortunate repercussions. FWIW if the 9mm dia. axle is threaded where it passes through the dropouts, it should be possible to make some spacers that are threaded on the inside but are 10mm OD. With a motorised wheel, I much prefer to use a separate torque arm instead of just washers.
Now it is entirely up to you if you have a secondary wheel retention system or not but should you ever sell a bike on having disabled it, there could be unfortunate repercussions. FWIW if the 9mm dia. axle is threaded where it passes through the dropouts, it should be possible to make some spacers that are threaded on the inside but are 10mm OD. With a motorised wheel, I much prefer to use a separate torque arm instead of just washers.
- 27 Mar 2024, 4:36pm
- Forum: Bikes & Bits – Technical section
- Topic: how slow do they get?
- Replies: 17
- Views: 1104
Re: how slow do they get?
with presta valves I am happy enough to forgo a front dustcap. However the other valve types have sufficient propensity to leak or get clogged etc. that I regard the secondary seal as more or less essential.
- 27 Mar 2024, 1:51pm
- Forum: Bikes & Bits – Technical section
- Topic: Broken Chain! I’m a complete amateur
- Replies: 17
- Views: 1012
Re: Broken Chain! I’m a complete amateur
I am not 100% sure about 12s, but 11s campag chain is meant be joined with a peened rivet. This puts off anybody who is keen on chain waxing.NickJP wrote: ↑27 Mar 2024, 5:36amI've had a Rohloff Revolver chain tool for many years. It has a tungsten carbide anvil that peens the end of the joining pin. After driving the joining pin through the chain and snapping off the excess length, you rotate that anvil in line with the pin, lock it down, and then apply considerable force to the other end of the pin to peen the end that's come through the chain so that it can't back out. Until recently, all Shimano chains used the joining pin, even 11s chains, but I haven't had anyone come back to me complaining of a failure at the joining pin after this treatment.
PXL_20240327_050447226.jpg
- 27 Mar 2024, 1:29pm
- Forum: Bikes & Bits – Technical section
- Topic: Noisy freehub - quieten with grease?
- Replies: 35
- Views: 1526
Re: Noisy freehub - quieten with grease?
I have done a lot of riding on shared use paths in recent years and it is fair to say that hitherto I hadn't really appreciated how useful a good bell could be.hoogerbooger wrote: ↑27 Mar 2024, 9:09amOr just very irritating when you're out to enjoy the sights and sounds of the countryside.......plancashire wrote: ↑26 Mar 2024, 9:46pm A noisy freehub can be a useful addition to a bell on shared-use paths, of which we have a lot in Germany. People recognise the sound. Pedal backwards for even more volume.
- 27 Mar 2024, 12:22pm
- Forum: Bikes & Bits – Technical section
- Topic: Tiagra ST-4703 Shifter Not Working
- Replies: 19
- Views: 566
Re: Tiagra ST-4703 Shifter Not Working
water only helps corrosion along if it is allowed to linger and/or it is contaminated. It is pretty harmless otherwise.
- 27 Mar 2024, 12:07pm
- Forum: Bikes & Bits – Technical section
- Topic: issue with new inner ring on ultegra hollowtech
- Replies: 10
- Views: 511
Re: issue with new inner ring on ultegra hollowtech
I think you can use a variant of the SG method it if you want. The trick here would be to mount the crank accurately in a chuck. I think you can make a suitable fixture using a crank extractor and some studding. The fixture would mount to the crank extractor threads. You can tell if the thing is running true or not before you start to dress anything. I think you can use a simple wooden fixture to help hold a dremel tool in the,right place, and the crank can be rotated slowly past it.Cyclothesist wrote: ↑27 Mar 2024, 10:29am ...... Filing the spider arms would seem to be the logical option, but probably difficult to do with great accuracy using hand tools. Additionaly it may mean I have a spider that's perfect for the FSA/Spa mixed manufacturer rings but nothing else. .....
I don't think you need to worry overly about making the spider arms 'too thin' because it isn't difficult to add spacers if you have to..
- 27 Mar 2024, 10:21am
- Forum: Bikes & Bits – Technical section
- Topic: Tiagra ST-4703 Shifter Not Working
- Replies: 19
- Views: 566
Re: Tiagra ST-4703 Shifter Not Working
IME it is worth trying something like GT85 just because the solvent is different. Once the shifter is off the bike the hood can be removed and the shIfter can be liberally sprayed with GT85 and left inside a ziplock bag overnight. This usually resolves any dried grease issues there might be. In the longer term a regular dose of aerosol SFG keeps the shifter sweet, but a synthetic oil might last longer because it doesn't degrade in the same way.
- 26 Mar 2024, 8:32pm
- Forum: Bikes & Bits – Technical section
- Topic: Noisy freehub - quieten with grease?
- Replies: 35
- Views: 1526
Re: Noisy freehub - quieten with grease?
it is nearly always worth mentioning what hubs/riding style/lubrication method you use. IME if a standard shimano two pawl-freehub is packed with #2 grease, it'll be somewhat 'missy' and prone to damage, especially if it is a bit cold. If there is any damage then the freehub body will need a rebuild at least. By contrast, a freehub with stronger springs in it might have been fine. It can be very easy to cause damage inside a freehub mechanism by using a lubricant that is too thick.