March 12, 201610 yr does it have any makers name on it or is it just blank? can find every size bar 21.3mm so there custom made or Bosch are machining them to fit.
March 12, 201610 yr does it have any makers name on it or is it just blank? can find every size bar 21.3mm so there custom made or Bosch are machining them to fit. I forget now, but I did get a price from the far east for a batch of them, Again I forget how many was a minimum, 500 perhaps more. Oh hang on NBR bearings I think. Not sure this is exactly the right bearing, but NBR do make custom bearings.
March 12, 201610 yr what about trying to get it refurbished ? http://www.ahrinternational.com/bearing_repair_and_refurbishment.htm http://www.astbearings.com/bearings-refurbished.html
March 13, 201610 yr http://i276.photobucket.com/albums/kk37/necromunger666/IMG_20160307_120500%201.jpg
March 13, 201610 yr Author http://i276.photobucket.com/albums/kk37/necromunger666/IMG_20160307_120500%201.jpg Looking at this broken down makes the whole thing look relatively simple, which makes it odd that spare parts are not available. .
March 13, 201610 yr Looking at this broken down makes the whole thing look relatively simple, which makes it odd that spare parts are not available. . Interesting how Bosch copied Panasonic with much of this assembly and their torque sensing method. Can't blame them, it was always the best. Panasonic don't make any spares available either, but have had the good sense to use standard bearings, available everywhere. .
March 13, 201610 yr but have had the good sense to use standard bearings, available everywhere. It was the ISIS compatible spindle that dictated the centre bore size, however cartridge bearings that fit in a normal bottom bracket are smaller in both diameter and width. Drawings of them list the size between 21.2mm and 21.4 mm in diameter.
March 13, 201610 yr Speaking to an engineer this morning about this, he suggested two companies to try. Kent Bearings and Simply Bearings. He also said that in the past he has been caught out when searching for bearing sizes, because most are measured in metric. He said that as a long short, re measure the bearing using imperial and then search. Don't convert the measurement using a computer though, as it might be incorrect to the bearing size.
March 13, 201610 yr Speaking to an engineer this morning about this, he suggested two companies to try. Kent Bearings and Simply Bearings. He also said that in the past he has been caught out when searching for bearing sizes, because most are measured in metric. He said that as a long short, re measure the bearing using imperial and then search. Don't convert the measurement using a computer though, as it might be incorrect to the bearing size. Thanks Eddie, I tried several large bearing retailers, all came back and said it was a custom bearing. I did also look at imperial bearings at the time, but nothing matched.
March 13, 201610 yr Is it possible to have the shaft ground to fit a standard bearing? No because the crank arms wouldn't then be a good fit on 20mm axle. You could make a bush to hold one of the smaller ISIS bearings though. and it is possible to buy that special NBR bearing if you're really stuck, at the time I wasn't convinced it was the right size at 21.4 mm. but it's probably okay. I'll worry when I wear the next drive bearing out in 4000 miles or so. Perhaps there'll be a easy supply by then.
March 13, 201610 yr Brand: SKF Inside Diameter: 21.3mm Outside Diameter: 42mm Width: 12mm Seals / Shields: Rubber Sealed Clearance: * Standard did you still want it as she works for skf and gave the above size.
March 13, 201610 yr will not know till she goes to work and finds out but if have 1 that size will get it for like 10 quid plus postage to you.
March 13, 201610 yr Author will not know till she goes to work and finds out but if have 1 that size will get it for like 10 quid plus postage to you. I hope some of the more enterprising among us are taking notes here...
March 13, 201610 yr Author Oh my light is so very dim! Of course bosch would use non std bearings. It's no accident that this makes them hard to repair forcing us to do a motor exchange. Std bearings would make this job easy and cheap! Clever Mr bosch!
March 13, 201610 yr tbh bosch are a pita as not even dealers can open the motor as will void any warranty and will not supply any motor parts to dealers or the public. tho ktm should have sorted him a bearing long ago as its a bearing and can be made to size but might cost a bit more. even if it was 50 quid to make 1 lot cheaper than 600 euro for a new motor and there is only 1 place that sells those as not 1 uk dealer can sell 1 or have any stock.
March 14, 201610 yr No because the crank arms wouldn't then be a good fit on 20mm axle. You could make a bush to hold one of the smaller ISIS bearings though. and it is possible to buy that special NBR bearing if you're really stuck, at the time I wasn't convinced it was the right size at 21.4 mm. but it's probably okay. I'll worry when I wear the next drive bearing out in 4000 miles or so. Perhaps there'll be a easy supply by then. Was hoping that the bearing face of the shaft was larger than the O/D of the splines. Obviously not. Let's see if Soundwave delivers.
March 14, 201610 yr artstu are you 100% sure its 21.3mm?? i put a post on the german forum if you want to reply there. http://www.pedelecforum.de/forum/index.php?threads/bosch-classic-bearings.39321/
March 14, 201610 yr artstu are you 100% sure its 21.3mm?? i put a post on the german forum if you want to reply there. http://www.pedelecforum.de/forum/index.php?threads/bosch-classic-bearings.39321/ Not 100% that's why I said it needed confirming. However ISIS axles are between 21.2 and 21.4 mm, so I'm fairly sure. My digital vernier had just packed in at the time.
March 14, 201610 yr I saw that. I'm not pulling my motor to bits again just yet, I can measure the shaft if I pull the crank arm off. I just need someone to explain how you read an old vernier, like an idiots guide please? Does that 21.3 mm you mentioned exist then?
March 14, 201610 yr it can be made that size just like you only found 20mm tho guess that normal sizes. i also sent a email to another place to see what they say and will post if i get a reply back. a new 1 is only 10 quid http://www.appliancespareswarehouse.co.uk/6-inch-digital-vernier-caliper-150mm-mis400.html?gclid=Cj0KEQjwwpm3BRDuh5awn4qJpLwBEiQAATTAQcvTo2UM4VI-BZY9pRSRWMAAvIMWkAK-fBhh4UX--NEaAj8M8P8HAQ Because 21,3mm does not exist. In german we say: Wer mißt mißt Mist. It might be that 20x42x12. Bearing 6004RS. He shold disasemle it first and measure it exaclty.
March 14, 201610 yr Doh, any idiot can read a digital one, what I need to do is read this. http://www.wikihow.com/Use-a-Vernier-Caliper
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