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Thread: Bridgestone BT-45 bad news !!!

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    Bridgestone BT-45 bad news !!!

    ]I just spoke with the engineers at Bridgestone. Our beloved BT-45 in 100/90-18 is no longer available in V rated. They have discontinued it.

    The two replacement options are BT-45 100/90-18 in an H rating or 110/90-18 in a V rating. The 110 is .75" taller and .5" wider. It is my belief that the H rated tire in the proper size would have less adverse effect on handling (mainly turn in). If you keep it under 130, it will handle the speed.


    (UPDATE! The above replacement recommendations are INCORRECT. See post #7 below)



    The rear 130/90-17 is still available in V rated.



    Last edited by 98lee; 03-19-2013 at 05:21 PM. Reason: New info
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    This doesn't worry me in the slightest, as the H-rated tires work just fine, and last longer too!

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    Ken ken e's Avatar
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    Quote Originally Posted by 98lee View Post
    If you keep it under 130, it will handle the speed.
    Only had the K75 up to an indicated 125 once, which was probably 120 actual.

    The BT-45 was my tire of choice.
    Ken E.
    2012 R1200RT
    '09 RT, '93 K75, '69 R60US and others long gone....

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    Can't find the 18" H

    Planned to change the front after a little spring riding so I put off ordering the tire over the winter. Bad decision. I've only used the BT-45 on my bike and don't know what would be a good alternative if I can't find the H rated.
    Regarding the H rated BT-45, I can't find a store that carries the 100/90-18 BT-45H. Where are you guys finding it?
    Robert Horton
    95 K75RT

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    Benchwrenching PGlaves's Avatar
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    Quote Originally Posted by sleeper View Post
    Planned to change the front after a little spring riding so I put off ordering the tire over the winter. Bad decision. I've only used the BT-45 on my bike and don't know what would be a good alternative if I can't find the H rated.
    Regarding the H rated BT-45, I can't find a store that carries the 100/90-18 BT-45H. Where are you guys finding it?
    I would go to my dealer/vendor of choice. Tell them what I wanted. Have them order the tire. Pick my tire up or get it in the mail or UPS in about a week or so.
    Paul Glaves - "Big Bend", Texas U.S.A
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    Bridgestone BT-45 bad news!!!

    It has been my understanding that the V or H rating was a rating for continuos speeds. I don't know how long continuos means time wise, but I faintly recall a tire dealer telling me it was one hour. How many people need more than a H rating on the street? Aren't V ratings a little more expensive to manufacture because of the compound? V rated tires sound like a better tire to the performance folks as they may be a little softer (?). Years ago when the same size tires were listed together, the H rated tires were always a little cheaper. I always ask for H rated when they are available.They have worked just fine for me for many years, and have used them for serious mountain sporting and granny touring. I personally have never run continuously above 90 mph for more than an hour anyway.
    I only have a jumbled opinions about tires, acquired over a lot of years. What's the real story on V and H ratings and what sort of mileage is an average person getting on BT- 45s? Never used 'em.

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    Update after further conversation with Bridgestone engineers:

    They have no listing of a 100/90-18 BT45 H being available (even though I remember seeing it on Motorcycle Superstores site in the past. Not now). So that's out as an option.

    The recommended replacement is a 110/80-18 Bt45V (that's an 80 aspect ratio, NOT 90). Only 4mm smaller diameter, so it will minimally effect rake and trail. 7mm wider so it should still fit.

    To those that really like to push it through the twisties, we would all really appreciate any feedback on the handling differences between the 100/90 and the 110/80 once you have acctually tried them. It will be awhile for me as I have 4 new 100/90s to burn through before I have to make the switch.



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    how many miles are folks getting with these tires? On my old GS, I be luck to get about 6-8k miles out of a set of tires. But last conversation I had with the service guy discussing about the K bike tires, he seemed to imply these tires last much longer. I was just curious.

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    These tires are not a high mileage tire like the Metzler Marathons. They are a REALLY good performance tire (read as: hauling a** through the twisties). If mileage is your highest priority, these probably aren't the tires for you. You would probably get less than you got on your GS.


    My comment on tire mileage is the same as my comment on gas mileage; I ride for SMILEAGE not MILEAGE!



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    thanks for the comment. I'm not too concerned with the mileage either with the K100 since it's not going to be a communter bike but more a weekend toy. I also enjoy the fact that it's old enough that I'm not afraid to wrench it myself to avoid paying $100/hr shop rates. I just got the bike and it's wearing 16 year old tires with 3 digit production dates on them. I went cheap and got the Lasertec as replacement this time but will probably get something more performance oriented next time.

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    The Lasertecs are pretty good. They were pretty much the best tire for K75Ss and K100RSs before the BT45s came out. The. Lasertecs have a mild tendency to continue falling into a corner requiring mild corection mid-turn. Due to their larger crown radius (more like modern radials), the BT45s eliminate that and are much more linear on turn in. But the Lasertecs are still a very good bias ply tire (not many bias tires left).



    Last edited by 98lee; 03-19-2013 at 11:18 PM.
    LONG MAY YOUR BRICK FLY!

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    Quote Originally Posted by cy7878 View Post
    how many miles are folks getting with these tires? On my old GS, I be luck to get about 6-8k miles out of a set of tires. But last conversation I had with the service guy discussing about the K bike tires, he seemed to imply these tires last much longer. I was just curious.
    I'm getting 8K+ on both front and rear. I'm probably anomalous as I commute 55 miles/day at low to moderate speeds on (relatively) clean freeways (405 & 5 between Santa Clarita & West L.A., for locals).

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    Quote Originally Posted by JamesInCA View Post
    I'm getting 8K+ on both front and rear. I'm probably anomalous as I commute 55 miles/day at low to moderate speeds on (relatively) clean freeways (405 & 5 between Santa Clarita & West L.A., for locals).
    You get 8k on a BT45 rear????? Wow!

    What bike?

    LONG MAY YOUR BRICK FLY!

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    Lee Fulton Forum Moderator
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    Quote Originally Posted by 98lee View Post
    You get 8k on a BT45 rear????? Wow!

    What bike?

    I was shocked too, after reading about the tire. I chose it figuring I'd be willing to give up some tread life for the extra sticky, but it's been great.

    1987 K75C

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    James,
    What tire pressure are you running on the rear?



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
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