Stronglight Impact chainset
Having recently acquired one for use on my winter steed I see it has "stronglight xtractor" system. Being well used to 'old' stronglight sets with 'norma'l extractor tools required it appears all this need is allen key to instal and/or extract the crank- is it really this simple or am I missing something ?
Any help would be appreciated in case I make a mess of this !
Any help would be appreciated in case I make a mess of this !
0
Comments
-
It really is that simple.
However I'm not completely convinced that self extracting crank bolts are a good idea for normal use. You can't easily grease the bolt threads, and an allen key isn't really big enough to get the cranks on sufficiently tightly. I use normal crank bolts, and replace them with self extracting bolts before going on tour, without removing the cranks. If I did remove the cranks (to check BB or whatever), I fit using normal bolts, and then fit the self extracting bolts.
I did once undo a self extracting bolt (Middleburn), which came out leaving the crank still on the bike. Fortunately it was the threads in the extractor cap that had stripped and not those in the cranks, so I was able to use a normal extractor once I'd picked the swarf out of the crank threads.0 -
+1
they look good, but when removing the crank I undo the self-extractors and use a standard crank extractor instead.Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer0 -
I have Impact chainsets on three bikes.I remove them regularly for cleaning and have never had a problem.As for tightening them,I use a long-handled allen key - 180mm.
There is a good choice of chainrings available from Spa Cycles.
http://www.spacycles.co.uk/products.php?plid=m2b0s149p00 -
:roll: Thanks guys for all your replies.
Andrew- How do you get the self extractor bolts out? Mine appear to be held within by a washer which justs turns.
maddog- As above- are there then threads within the crank to screw the 'normal' extractor into?
croggy- good to know you have had no problems- I am changing to this Compact c'set after years of using an S80 double/triple for winter use- thought it would be easier !!0 -
grayboots wrote:- are there then threads within the crank to screw the 'normal' extractor into?!
the outer part of the bolts should undo from the crank with a two-pin tool - I use a bent old kitchen fork 8) That's how they are on Syncros/Middleburn bolts anyway. Careful when undoing them as you can scratch the anodising.
Once the outer part is undone, you just have the crank bolt itself. Undo that, then fit a traditional extractor tool and away you go.Facts are meaningless, you can use facts to prove anything that's remotely true! - Homer0 -
Last time I bought an Impact chainset it had normal crank bolts.
Self extracting crank bolts normally have a 6mm allen head with a wide flange on it. They screw in normally, then there's a thin brass washer that fits on top of the flange, and a collar that screws in on top of the flange using the extractor threads. The collar is normally screwed in using a pin wrench in two holes in the outside face of the collar. When you undo the crank bolt, the flange only moves a short way before coming up against the collar. If you continue to undo the crank bolt, there's more friction in the threads holding the collar in the extractor threads than there is between the flange and the inside face of the collar, so rather than the collar unscrewing, it stays put and the crank is pushed off by the flange.
I suppose it's possible that the self-extracting bolts could be made as a permanent part of the crank, but I've never seen it.0 -
Hi guys
Sorry for delay- been grandson sitting this weekend !!
Took your advices- undid with a nail and some pliers [!] as my pin wrench was slightly too large.
So, all sorted now- thanks again for all your help.
Cheers0
