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Thread: Difference between an R100T and an R100RT?

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  1. #1
    --Tony AnnapolisAirhead's Avatar
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    Question Difference between an R100T and an R100RT?

    Anyone know what difference there is between a R100T and a R100RT? Is it just the fairing?

    I've lusted after a late model R100RT for a while, but my (R100T) bike was a pretty good deal so I have it. Great to join the airhead gang.

    I've got a Windjammer fairing from the PO, that seems heavy and looks heavy. I found a pretty good deal on a used RT fairing and frame/mounts but there is no doubt more to a conversion than that. I'm thinking lots of wiring (yikes)...

    As far as I can tell though, the diff seems to be fairing and badges (maybe rear brakes--mine is drum). I have dual front Brembos, Bing 40mm, flat/ram-air type snorkel air box, seat w/ cowling.

    Maybe better off enjoying this until I find a straight early 90's RT??
    1971 BMW R75/5 | 1975 Moto Guzzi 850T Cafe | 1983 BMW R100RS | 1988 BMW R100GS
    1988 BMW K75 | 1998 BWM R1100RT | 2000 Moto Guzzi Quota 1100ES |2002 Moto Guzzi V11 LeMans

  2. #2
    Registered User paulj's Avatar
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    model confusion

    Check this link - http://www.bmbikes.co.uk/bmwphotos.htm - for all the answers you might want about model variations.
    Paul

  3. #3
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by oldpaul View Post
    Check this link - http://www.bmbikes.co.uk/bmwphotos.htm - for all the answers you might want about model variations.
    Intentionally done by BMW, ya think? I've seen earlier model R100T bikes that have that on their side covers. Mine just says R100 (no T), yet a lookup of the VIN indicates an R100T (as the PO said). I also read in Dr. Ian Falloon's restoration guide that the later R100T bikes simply said R100.

    In the end, I suppose the only thing I am really concerned about it getting the 50+ lbs. Vetter off the front and replacing it with an RT. If it weighs the same, it sure looks better to my eye and I've heard decent reports about handling and MPG improvements.

    Once set, I plan to make a run from Annapolis to northern Maine, then another to repeat a 27 state, US perimeter trip I did 26 years ago in a 1969 Ford Falcon. Anyone care to join?



    Upon further review of the link provided above, looks like some diffs:

    RT 70hp, 56ft/lb torque and 9.5:1 compression, 515-525 lbs unladen weight, top speed 118mph, 0-62mph=5.0 seconds
    R100T 67hp, 53ft/lb torque and 8.2:1 compression, 480 lbs unladen weight, top speed 121mph, 0-62mph=4.6 seconds

    Both have 6.34 gallon fuel tank. The R100RT has rear disc brakes, unlike the R100T. Compression seems to be one of the not so obvious differences.
    Last edited by AnnapolisAirhead; 06-20-2008 at 01:45 PM.
    1971 BMW R75/5 | 1975 Moto Guzzi 850T Cafe | 1983 BMW R100RS | 1988 BMW R100GS
    1988 BMW K75 | 1998 BWM R1100RT | 2000 Moto Guzzi Quota 1100ES |2002 Moto Guzzi V11 LeMans

  4. #4
    shire2000
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    I think that you will find performance to not be such a big deal on an RT. The comfort of riding behind the wonderful RT fairing will far outweigh any performance differences. I have had a few RTs and can attest to the aerodynamics of the fairing. BMW created them thru thorough testing in windtunnels to develope probably the best touring fairing of it's day, if not still. The only sleeker fairing would be the RS, which is for sport touring.

    My current 1981 RT gets on average 48MPG, can attain a radar gun proven 115MPH with 2 up and fully loaded. Got a ticket last month trying to make a fast run for the last ferry of the day. Missed the ferry due to gendarme's long winded speech. He was going on about my collector's plate and riding such an "old" bike at such speed.

    As to differences, The rear disc brake is great, if you spend lots of time setting it up just right and bleeding it is a real bugger. Lots of people have converted them to drum due to easier maintenance. The fairing weighs in around 45Lbs. but once you get moving, you really don't notice it. I would suggest a set of progressive springs in the front forks and a little heavier oil - I use a weight of 7.5 and 10cc extra in each fork. Works well for me, but everybody rides differently. Experiment with it, to find what is best for your riding style.

    Once you have the RT fairing mounted, you will love it.

  5. #5
    TGHSMITH
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    about the only real differances between the vetter and bmw rt fairing you see is lowers that work well in the cold and rain with the bmw, the vetter is not a fifty pound fairing. I had the windjammer off my wifes r100t last year for painting and restoration, the weight differance is a coin toss, if your thinking off converting to a rt fairing get ready to toss some coins, lots of bits and pieces to get(2 mounts, new headlight glass and bezel,all the fairing pieces,) look on the max bmw's parts fisch to see everthing involved,

  6. #6
    Unregistered User dduelin's Avatar
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    What little I know about it is that the 100T was not sold in the US market, the 100T was a european spec bike sold until 1980 in markets other than the US. The 100T came with the two extra gauges of the RT (voltmeter and ???) set just outboard of the speedo/tach unit. I also believe they came with BMW hard bags or at least the mounts.

    Yes, a BMW VIN search shows the model as 100T in model years 81-84 but they were sold in the US simply as R100's and came without the gauge package of the earlier 100T. All 81-84 R100's ("T", CS, RT, RS) exported to the US had the same 8.2:1 compression ratio so there was no hp difference between models on this side of the pond.

    I ordered side cover decals for my bike from a dealer and the ones that came from Germany were "100/T " and did not match period brochures I have for 81-84 US bikes but did match pictures of the 76-80 100/T. I went back and ordered decals for a 100T manufactured after 6/80 and they came back correct - simply "R 100". My bike is second serial number in production month 9/80.
    Dave
    R1200RT
    ST1300
    NC700XD

  7. #7
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by shire2000 View Post
    I think that you will find performance to not be such a big deal on an RT. The comfort of riding behind the wonderful RT fairing will far outweigh any performance differences. I have had a few RTs and can attest to the aerodynamics of the fairing. BMW created them thru thorough testing in windtunnels to develope probably the best touring fairing of it's day, if not still. The only sleeker fairing would be the RS, which is for sport touring.

    My current 1981 RT gets on average 48MPG, can attain a radar gun proven 115MPH with 2 up and fully loaded. Got a ticket last month trying to make a fast run for the last ferry of the day. Missed the ferry due to gendarme's long winded speech. He was going on about my collector's plate and riding such an "old" bike at such speed.

    As to differences, The rear disc brake is great, if you spend lots of time setting it up just right and bleeding it is a real bugger. Lots of people have converted them to drum due to easier maintenance. The fairing weighs in around 45Lbs. but once you get moving, you really don't notice it. I would suggest a set of progressive springs in the front forks and a little heavier oil - I use a weight of 7.5 and 10cc extra in each fork. Works well for me, but everybody rides differently. Experiment with it, to find what is best for your riding style.

    Once you have the RT fairing mounted, you will love it.
    I hope so, great look. I like the RS fairing too...just couldn't find one in my price range. In the end, I'll overspend but be happy.
    1971 BMW R75/5 | 1975 Moto Guzzi 850T Cafe | 1983 BMW R100RS | 1988 BMW R100GS
    1988 BMW K75 | 1998 BWM R1100RT | 2000 Moto Guzzi Quota 1100ES |2002 Moto Guzzi V11 LeMans

  8. #8
    Registered User barryg's Avatar
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    Cycle World ON BMW 1974-80 has an article about the R100T. Page 78 and 79 with acouple of pictures. Good info. Your not going to find a lot of info on this bike. BMW built a touring model of the S. Came without the S fairing with standard US bars. U could add BMW and period accessories as U choose. I think BMW dropped this bike and the T replaced it. Same book has a couple articles about that bike too.

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