Ebola

Hi. I have an old, very well functional Kalkhoff Pro Connect 2011. However, now I have to replace the bearings for the headset/stem - they were broken and rusty. It is an integrated type, and I suspect it to be an IS41 type (SHIS) - Integrated-angular contact, 1-1/8 inch steering column, 36 x 45 degree contact “IS” or “Cane Creek® types. It appears to have a height of about 7mm. Does anyone know a compatible bearing I can purchase that might fit? Images for the stem is here Cheers

I am having some problems with my new Kalkhoff Pro Connect C8. The bike feels heavy to use and it started about 3 weeks ago. I got the bike in mid/late April. The bike is heavy to use, and feels even more heavy the more assist I choose. Also, if I do not use assist (even remove battery) the bike is heavy. It feels as if I am running it with the motor sprocket connected to the engine (e.g. a dynamo). The more I use the pedals the more I can feel the resistance. If I use very little force on the pedals I can hardly feel the resistance. I do not have any sound issues. My bike has a 19T rear sprocket and 11T motor sprocket. According to Shimano tech documents, only 18T and 20T sprockets should be used with the alfine 8 rear hub if i a chain tensioner is in use: http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Alfine/SGS501/37N0A-001_SG-S501-EN_v1_m56577569830638091.pdf "If using a chain tensioner, use the special CS-S500 18T or 20T sprocket with chain guard. Do not use any other types of sprockets, otherwise the chain may come off the sprockets." Not sure if this is part of the problem, as it might just be to prevent the chain to fall off. I believe that my problem might be caused by the engine, and that the engine is connected to the motor sprocket so as it feels heavy. However, maybe this also can be caused by the wrong use of sprockets and assembly of these? I have been waiting 2 weeks now to hear back from 50Cycles as they are waiting for answers from Germany. I hope to fix the bike soon (not been using it since this problem started). Great work guys, hopefully some of you talented people will figure it out.

Sorry to get into this post but my new Kalkhoff Pro Connect C8 is having some of these issues. I contacted 50Cycles 2 weeks ago about it and they still do not know what it is (still waiting for a reply from Germany). The problem I have is not associated with noise but with the bike feeling rough/heavy to use. It started about 3 weeks ago (I got the bike in the middle/end of April this year). It started to be more heavy to use, and using the 2:1 assist seem to almost make it worse. Also, if I use the bike with no motor assist it is heavy and more heavy the more force I use on the pedals, even if I remove the battery. It feels as if the motor itself is still on/connected but not running and hence slow the bike down (e.g. like using a dynamo). As soon as I had this problem I stopped using the bike as I was afraid it could damage the engine. Now, when the bike was shipped it had 19 teeth rear sprocket, but from the Shimano web site it appears that the hub gears should only use 20 or 18 teeth? http://techdocs.shimano.com/media/techdocs/content/cycle/SI/Alfine/SGS501/37N0A-001_SG-S501-EN_v1_m56577569830638091.pdf "If using a chain tensioner, use the special CS-S500 18T or 20T sprocket with chain guard. Do not use any other types of sprockets, otherwise the chain may come off the sprockets." Not sure this is the problem though but could not see that anyone had mentioned this before. Could it be that the engine is not letting go and hence the sprocket is running some of the parts in the engine? I am not a mechanic so I can't give you proper terminology, so please see beyond the faulty language. I really want to figure out what the problem is as I am now using my old bike for commuting. Using the Pro Connect for almost 2 months makes this a bad experience. I am praying for a solution ...

I have cracks in my Continental tyres too, and I got the PC Disc 2011 about 3 months ago. 50cycles told me that the cracks are just in the outer layer and possess no problem. However, I am worried about the rubber quality as I can't understand that cracks should appear so soon (or appear at all). I suggest all PC Disc owners keep an eye on the tyres. Would be bad to get a tyre blow out in mid traffic.