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Thread: Difference between an R100T and an R100RT?

  1. #16
    bike junkie...
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    R100T erratta

    The R100T models were sold in the US market in 1979 and 1980.

    As stated before, they had the same 40mm carb engine as the S, RS, and RT models. I've never seen a US model that had 40mm exhaust.

    The R100T models for the US came with dual front discs, aux clock and voltmeter, chrome mounts for the aux gauges. chrome engine guards, chrome saddlebag mounts (but no bags), chrome side lift handle, aux. power outlet, that damn annoying turn signal buzzer, and the BMW windshield. They had the same /7 seat as on the '78 R80/7 and R100/7 models (i.e. chrome handrail and no seat cowl). Final drive was a drum brake set-up with the 2.91 gearing. I've never seen any BMW sheets for NA showing other than the two-tone metallic red/silver paint for '79. The '80 models were available in Metallic Red. Sidecovers on the '79 were silver, with the 1980 models being red. Sidecover decals were different for the two years. The '79 model year also had a few month sales promotion that included a Luftmeister fairing being included for the buyer, so a lot of these bikes ended up with them.

    Many riders of the time thought the R100T a better "riders" bike than the R100S due to the more comfortable seat and rear drum brake.

    While the R100T models were available in later years in other markets, the US saw it replaced with the R100 beginning in 1981. The '81 and later R100 models in the US were not considered T models as they did not include the BMW touring equipment package.

    The next "T" model for the US was the '87 K75T, which repeated some of the above with the inclusion of the factory saddlebag mounts, BMW windshield and (as I recall) engine guards.

    The earlier post about the R100T being a follow up to the 78 R100S models is correct. BMW had three R100S models in the US in '78, including one production run that came with high bars, drum rear brake, and (gasp!) dealer installed Luftmeister fairings....(cue Marlon Brando uttering "the horror"...).


    Eddie

  2. #17
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by Rev_Eddie View Post
    The R100T models were sold in the US market in 1979 and 1980.

    As stated before, they had the same 40mm carb engine as the S, RS, and RT models. I've never seen a US model that had 40mm exhaust.

    The R100T models for the US came with dual front discs, aux clock and voltmeter, chrome mounts for the aux gauges. chrome engine guards, chrome saddlebag mounts (but no bags), chrome side lift handle, aux. power outlet, that damn annoying turn signal buzzer, and the BMW windshield. They had the same /7 seat as on the '78 R80/7 and R100/7 models (i.e. chrome handrail and no seat cowl). Final drive was a drum brake set-up with the 2.91 gearing. I've never seen any BMW sheets for NA showing other than the two-tone metallic red/silver paint for '79. The '80 models were available in Metallic Red. Sidecovers on the '79 were silver, with the 1980 models being red. Sidecover decals were different for the two years. The '79 model year also had a few month sales promotion that included a Luftmeister fairing being included for the buyer, so a lot of these bikes ended up with them.

    Many riders of the time thought the R100T a better "riders" bike than the R100S due to the more comfortable seat and rear drum brake.

    While the R100T models were available in later years in other markets, the US saw it replaced with the R100 beginning in 1981. The '81 and later R100 models in the US were not considered T models as they did not include the BMW touring equipment package.

    The next "T" model for the US was the '87 K75T, which repeated some of the above with the inclusion of the factory saddlebag mounts, BMW windshield and (as I recall) engine guards.

    The earlier post about the R100T being a follow up to the 78 R100S models is correct. BMW had three R100S models in the US in '78, including one production run that came with high bars, drum rear brake, and (gasp!) dealer installed Luftmeister fairings....(cue Marlon Brando uttering "the horror"...).


    Eddie
    Eddie, great info thanks. I have volt, clock, annoying turn signal buzzer (which I disconnected), S-type seat with cowl. Looks like there was a rear seat rack but whan I got the bike it had a extendable Reynolds rack with a Luftmeister trunk (kinda niice thing to have actually) and a trailer hitch. Hitch, Reynolds rack and newer style Krauser sidebag mounts are all chrome. It came to me with the BMW touring panniers (large enough to fit my full face helmet inside). The seat has a push button lock, but the bike lift handle is black, not chromed. The seat itself is a very comfortable Corbin with removeable backrest for the rider.

    The bike has engine guards, highway pegs, dual plugged (different size plugs), dual front discs with Brembo calipers. The forks are non-gatored. Handle bars are US (high). MC on handlebar as is the choke (left). Exhaust looks stock to me, but in excellent shape and sounds nice---I think the mufflers are Kiehan ?? Air filter is a K&N, with a ramair type top (stock). I removed the emissions stuff. There are no cylinder head guards on my bike. The fairing is a Vetter with lowers and a barnsized wind/air/flying pig shield. Has a Cycle Sounds groovin' am/fm/cassette deck to play the very best Tom T. Hall on the steeeeeereo. Have to admit, with one of those casstte tapes with the wire dangling out to my ipod...its kinda nice.
    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

  3. #18
    TGHSMITH
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    if you are staying with the vetter, check under the turn signal grills they have an opening for mounting horns within the fairing. this opening was originally covered by foam sheet that most likely has gone away with age. in the 25 year reffit on my wife r100t I cut to circles of abs plastic and used abs pumbing cement and filled these for good (keeps water out of the fairing) the old tape radio was replaced with a modern unit that can use mp3 cards. new radio covers can be found through marine catalogs. ps your points in the can uses the same pionts as the vw bug (airhead vintage also) you can also clip the vetter windshield to the heigth needed. vetter has a good site for parts, carol vetter is great to deal with!!

  4. #19
    Registered User lkchris's Avatar
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    Quote Originally Posted by AnnapolisAirhead View Post
    I read that the RT was heavier (could be the fairing), has higher compression (9.2:1 or so) and 70 vs. 67 hp --like I'd be able to tell the difference. I read that the drive train was the same though.

    Not correct--all USA 1000 models had the same engine in the same year beginning in 1979.
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

  5. #20
    Registered User lkchris's Avatar
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    Quote Originally Posted by Rev_Eddie View Post
    I've never seen a US model that had 40mm exhaust.
    Pretty much only in 1977, maybe 1978.

    Didn't make any difference once the dual crossover arrived in 1981, as that accomplished the same thing.
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  6. #21
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by lkchris View Post
    Not correct--all USA 1000 models had the same engine in the same year beginning in 1979.
    Here's the R100RT specs: http://www.bmbikes.co.uk/specpages/R100RT.htm which claims:
    R100RT
    Displacement 980 cc
    Max Power 70 hp (51 KW) at 7,250 rpm
    Max Torque 77 Nm / 56 ft lb at 5,500 rpm
    Compression Ratio 9.5 : 1
    Rear Wheel Ratio 1 : 3.0 or 1 : 2.91
    Bevel/Crownwheel 11 / 33 teeth or 11 / 32 teeth
    Top Speed 190 Kph / 118 mph
    Acceleration 0 - 100 Kph / 62 mph 5.0 seconds


    Here's my bike specs: http://www.bmbikes.co.uk/specpages/R100.htm which claims:
    R100
    Displacement 980 cc
    Max Power 67 hp (49 KW) at 7,000 rpm
    Max Torque 72 Nm / 53.09 ft lb at 5,500 rpm
    Compression Ratio 8.2 : 1
    Rear Wheel Ratio 1 : 3.00
    Bevel/Crownwheel 11 / 33 teeth / US 11/32 as R100/T
    Top Speed 195 Kph / 121 mph
    Acceleration 0 - 100 Kph / 62 mph 4.6 seconds


    Not sure if the specs are for US or non-US models as they don't specify on the HP specs, except on the Bevel/Crownwheel. Could be that it was just easier to level the playing field, make them all the same for the bikes destined for the US market and that these numbers are for the euro and other non-US markets but that seems like a weird mod to manufacturing. Then again, these specs could be bullbutter too. I dunno.

    Anyway, that where I read about the HP delta. Its more of an idle curiosity than anything else--the number differences are marginal in my opinion.
    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

  7. #22
    Unregistered User dduelin's Avatar
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    Quote Originally Posted by AnnapolisAirhead View Post
    Here's the R100RT specs: http://www.bmbikes.co.uk/specpages/R100RT.htm which claims:
    R100RT
    Displacement 980 cc
    Max Power 70 hp (51 KW) at 7,250 rpm
    Max Torque 77 Nm / 56 ft lb at 5,500 rpm
    Compression Ratio 9.5 : 1
    Rear Wheel Ratio 1 : 3.0 or 1 : 2.91
    Bevel/Crownwheel 11 / 33 teeth or 11 / 32 teeth
    Top Speed 190 Kph / 118 mph
    Acceleration 0 - 100 Kph / 62 mph 5.0 seconds


    Here's my bike specs: http://www.bmbikes.co.uk/specpages/R100.htm which claims:
    R100
    Displacement 980 cc
    Max Power 67 hp (49 KW) at 7,000 rpm
    Max Torque 72 Nm / 53.09 ft lb at 5,500 rpm
    Compression Ratio 8.2 : 1
    Rear Wheel Ratio 1 : 3.00
    Bevel/Crownwheel 11 / 33 teeth / US 11/32 as R100/T
    Top Speed 195 Kph / 121 mph
    Acceleration 0 - 100 Kph / 62 mph 4.6 seconds


    Not sure if the specs are for US or non-US models as they don't specify on the HP specs, except on the Bevel/Crownwheel. Could be that it was just easier to level the playing field, make them all the same for the bikes destined for the US market and that these numbers are for the euro and other non-US markets but that seems like a weird mod to manufacturing. Then again, these specs could be bullbutter too. I dunno.

    Anyway, that where I read about the HP delta. Its more of an idle curiosity than anything else--the number differences are marginal in my opinion.
    If you still have the original owners manual it says the R100 (what you call the 100T) had the same 11/32 final drive as same year RT and RS bikes. After 1980 all US 1000cc bikes had 8.2:1 compression ratio. Plug your VIN in the chart on the bmbikes.co.uk site and see what month/year it was built.
    Dave
    R1200RT
    ST1300
    NC700XD

  8. #23
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by dduelin View Post
    If you still have the original owners manual it says the R100 (what you call the 100T) had the same 11/32 final drive as same year RT and RS bikes. After 1980 all US 1000cc bikes had 8.2:1 compression ratio. Plug your VIN in the chart on the bmbikes.co.uk site and see what month/year it was built.
    When I plug the VIN in, it tells me it is an R100T. Go figure.
    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

  9. #24
    Registered User lkchris's Avatar
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    Quote Originally Posted by AnnapolisAirhead View Post
    Not sure if the specs are for US or non-US models
    Those are non-US specs.

    All USA R100 from '80 or '81 on were low compression.

    8.2 from '80-'84

    8.5 from '87-'95
    Kent Christensen
    21482
    '12 R1200RT, '02 R1100S, '84 R80G/S

  10. #25
    --Tony AnnapolisAirhead's Avatar
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    Quote Originally Posted by lkchris View Post
    Those are non-US specs.

    All USA R100 from '80 or '81 on were low compression.

    8.2 from '80-'84

    8.5 from '87-'95
    Ok. I think that and dual ported heads mean unleaded is fine to run? I've been using premium--thinking it'd burn hotter and clear stuff from sitting 8+ years.
    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

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