CaptainKcorb Posted May 7, 2009 Posted May 7, 2009 At 140K Km the 100RT was making way too much noise to be ignored further and I ordered up two bobbin sets from Motobins for the front rotors. There was all kinds of play on the old originals; radial, axial and up-and-down. Will past their best before date. The Motobins site was easy to use and I appreciated the request for the bike's VIN assuming it's crossed to the parts you've ordered to catch errors. The price was great (38 Brit pounds all in) and the parts duly arrived in the mail in a couple of weeks. No duty levied here in Canada, and maybe elsewhere. I did the replacement with the wheel on the bike, taking about two hours. There were no issues and all bobbins slid in easily, and after a little profanity on the first couple, getting the circlips in with the spring washers became easier. My hamfistedness early on lead to a couple of clips becoming spread so while the clips are clearly up to the task, they could be a little more robust. While no bobbin was tight sliding in, there is no play that I can feel between the rotor and the carrier. This is causing no difference that I can detect to the feel of the brake and maybe I'd just forgotten the rotors snugness from back in 2000 when all was new. Another thought on the job is that the excessive play that I was running with seemed to have accelerated brake pad wear over last year as the pads that seemed to have lots of puck left last spring were down to their last flinder of lining. As I'd picked up the tip to check Motobins from another thread here I thought I'd offer my experience with them.
Ham Posted May 8, 2009 Posted May 8, 2009 +1 I had the pleasure of ordering the bobbins from them as well. Shipping to the States was faster than some of the other in-State vendors I have used. I would have no hesitation ordering from them again. Oh, my brakes feel better too.
smiller Posted May 8, 2009 Posted May 8, 2009 I thought I had read somewhere that the Motobins parts were made of a different (steel?) material than the aluminum alloy used in the OEM bobbins. Is this correct?
CaptainKcorb Posted May 9, 2009 Author Posted May 9, 2009 Yep, they are steel. Furthermore, they lack the complication of having that little spring clip every third button. In effect they change the brake from full to semi floating, at least when the buttons are brand new. I'd considered this and decided not to worry about it. The extra unsprung weight (from steel vs aluminum) is far less than the difference between an old and new tire, and I don't anticipate the steel wearing the rotors any more than the spring clips did as the rotors are still a stronger steel than the buttons. As to braking efficiency, they seem to work great though I haven't been able to give them a thorough workout in high heat conditions yet (they don't call us the Great White North for nothing). If there are any things I should be cautious over with the change please let me know.
smiller Posted May 9, 2009 Posted May 9, 2009 I'd considered this and decided not to worry about it. The extra unsprung weight (from steel vs aluminum) is far less than the difference between an old and new tire, and I don't anticipate the steel wearing the rotors any more than the spring clips did as the rotors are still a stronger steel than the buttons. Actually I agree and wasn't criticizing the use of steel, in fact it seems desirable to me. And yes, the spring clips in the OEM version are fairly useless, they are a PITA to install and only have an effect for a short time anyway.
Ham Posted May 10, 2009 Posted May 10, 2009 I recently installed some Loraine Carbon on the RTP and let me tell ya, nice! Great feel and plenty of grip on the rotors. The fronts were the high performance ones and the rear, I opted for the regular strength. Too lazy to dig up what the part numbers are at the moment.
ltljohn Posted May 10, 2009 Posted May 10, 2009 I recently installed some Loraine Carbon on the RTP and let me tell ya, nice! Great feel and plenty of grip on the rotors. The fronts were the high performance ones and the rear, I opted for the regular strength. Too lazy to dig up what the part numbers are at the moment. Beemer Boneyard has the Carbone Lorraine pads for a decent price
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