Yet Another Cycling Forum

General Category => Freewheeling => Velo Fixe => Topic started by: guidon on April 04, 2019, 07:24:06 pm

Title: system ex hubs
Post by: guidon on April 04, 2019, 07:24:06 pm
I have bought on of these with the idea of building up a rear wheel, double fixed. My problem is this - it was supplied without lockrings. So does anyone know what thread they are and where I can get some?? They are not the same size as Miche.... (king of dodgy purchases me...) Many thanks!
Title: Re: system ex hubs
Post by: Torslanda on April 04, 2019, 07:40:54 pm
Why should they be dodgy?  Amongst others they're used by Spa Cycles who offer custom builds with them.

At a guess if anyone knows the lockring thread size it will be the guys at Spa...
Title: Re: system ex hubs
Post by: guidon on April 04, 2019, 07:51:42 pm
John I wasn't implying that the hub is dodgy, merely my lust for end of line bargains!....Will try Spa if Ian H doesn't add his opinion, Surly do lockrings which should fit but I'm not sure....
Title: Re: system ex hubs
Post by: DaT on April 04, 2019, 07:52:29 pm
I have bought on of these with the idea of building up a rear wheel, double fixed. My problem is this - it was supplied without lockrings. So does anyone know what thread they are and where I can get some?? They are not the same size as Miche.... (king of dodgy purchases me...) Many thanks!
Miche lockrings aren't ISO (1.29" x 24 tpi) threaded, they're the same as Campy and Phil Wood (33.6 x 24TPI)
Title: Re: system ex hubs
Post by: Pickled Onion on April 04, 2019, 08:41:56 pm
I've not used lockrings for years — it's quite hard to unscrew a cog after you've ridden up a couple of hills, unless you're really into skid stops and enjoy replacing tyres.
Title: Re: system ex hubs
Post by: guidon on April 04, 2019, 10:04:09 pm
Thus Miche and Campy must be italian threaded, it is very unlikely that System ex will be french(!) thus must be ISO..... will double check...Many thanks all!
Title: Re: system ex hubs
Post by: mzjo on April 05, 2019, 08:25:32 am
Thus Miche and Campy must be italian threaded, it is very unlikely that System ex will be french(!) thus must be ISO..... will double check...Many thanks all!

PM sent!
Title: Re: system ex hubs
Post by: rogerzilla on April 05, 2019, 11:53:48 am
System EX/Formula etc are ISO.  Only Campag, Miche and Phil Wood use the Italian size that I know of.
Title: Re: system ex hubs
Post by: Ivan on April 05, 2019, 12:24:45 pm
I've not used lockrings for years — it's quite hard to unscrew a cog after you've ridden up a couple of hills, unless you're really into skid stops and enjoy replacing tyres.

I was the same until I unspooled my commuter's rear cog on the first descent from my house one morning last month, and I haven't touched that wheel in years.
Title: Re: system ex hubs
Post by: rogerzilla on April 06, 2019, 10:09:35 am
If you put a sprocket on with a 2 foot chainwhip, you're using about 5-6x the torque that your legs can apply through the cranks and the gearing.  However, if you ride a CTT time trial on a fixie and only have a front brake, you are required to have a lockring.
Title: Re: system ex hubs
Post by: LittleWheelsandBig on April 06, 2019, 10:16:04 am
My chainwhips have 300mm handles and many chainwhips have somewhat shorter handles.

A cold Al hub will contract more than a steel cog, so it becomes easier to get the cog off, which might explain Ivan's experience.
Title: Re: system ex hubs
Post by: rogerzilla on April 20, 2019, 11:23:10 am
You need to make your own chainwhip!  The ideal length is the diameter of a 700c wheel, plus a hand's width.  All you need is a piece of flat steel bar, a drill, a hammer and punch, and some bits of 1/8" chain.  I wrapped bar tape around the handle end.
Title: Re: system ex hubs
Post by: guidon on June 07, 2019, 02:55:32 pm
Indeed "british" thread - many thanks to Mzjo for his kind donation of vintage bits. Have'nt bothered with the lockring as it wouldn't screw on the hub so after constructing a "Zilla" chainwhip will doubt that it will ever come loose!!!! Have now fettled forks so that I have at least a front brake as its a little sketchy round here brakeless (motons abound!!!)....Looking forward to getting a few rides in....