Another Tire Story - BMW Luxury Touring Community
 
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post #1 of 12 Old Sep 10th, 2007, 6:54 pm Thread Starter
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Another Tire Story

Letter to Bridgestone


TJ

Been reading the BMW K1200LT forum on tires and have become confused and worried. I bought my 2005LT in July and had Las Vegas BMW install new tires on the bike before I purchased it I am from Canada and did this over the phone. I picked up my bike and rode it home and have done 9200KM since putting on the new tires. After my last trip I noticed both my tires were wearing badly to the point I'm afraid to take another trip which I would have too since my nearest dealer is 3hrs away. After reading the forum I checked the tires much to my dismay both tires are radial and the back one is not even load rated for my bike. We run the bike at heavy loads as we are both larger individuals and with luggage come close to allowed GVW of the bike. The front tire is cupping badly and the back is pretty well toast. I will send pictures if you want. Please could you supply me with all the details of the proper tires for my bike I don't want this happening again. I would go as far as to say the dealer put me in harms way by putting the wrong tire on the back as well as damaging the reputation of your company.

Daniel Magee
2005 K1200LT (BUZZ)
Medicine Hat AB Canada

Reply

Hi, Daniel! These are the tires that you should run:



BT020 Category: Street Application: Sport Touring

Front
Rear
Features




Sport Touring & Cruiser Radials designed for touring oriented sport riders offering solid performance and good mileage


Silica enriched compound offers exceptional level of grip on both wet & dry surfaces


Mono-spiral belt construction (rear) offers high speed stability and outstanding shock absorption


The letter code in some tire size and rating columns is stamped on the sidewall and the tire label, for easy identification

Article
Number
Tire
Size
Rim
Size
Tire
Description
OE
Code
Load
Rating
Speed
Rating
O/A
Dia
Tread
Width
Tread
Depth
(32's)
Approved
Rim
Max
Load
Max
PSI
O.E.

057537
120/70B17M/C
17
BT020F BW TL (BIAS)
M
58V
V
23.9
4.8
5
(3.50)3.50-3.75
520
42
BMW K1200LT 2005

057537
120/70B17M/C
17
BT020F BW TL (BIAS)
M
58V
V
23.9
4.8
5
(3.50)3.50-3.75
520
42
BMW K1200LT 2005-2006 (Bias Ply)

057554
160/70B17M/C
17
BT020R BW TL (BIAS)
M
79V
V
25.8
6.3
8
(5.00)4.25-5.00
963
48
BMW K1200LT 2005

057554
160/70B17M/C
17
BT020R BW TL (BIAS)
M
79V
V
25.8
6.3
8
(5.00)4.25-5.00
963
48
BMW K1200LT 2005-2006 (Bias Ply)




If you guys are riding two up run the air pressure at 42FRT/48Rear, if one up run the pressure at 42FRT/48Rear (That should resolve your cupping issue). Next year Dunlop may be producing a tire for the K1200LT and the GL1800 that has extra load carrying capability. You may want to take a look at it when it comes out (Im not sure what it will be called).



Norris "T.J." Tennent

Engineering Product Manager/Motorcycle, ATV, Kart, Fuzion

Bridgestone Firestone North American Tire, LLC

(615) 937-3591

www.motorcycle-karttires.com
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post #2 of 12 Old Sep 10th, 2007, 9:49 pm
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Daniel,
The 05's are supposed to use the bias Bridgestones tire but I am sure the proper radial is just fine. What tire and load rating did they put on your bike? 42 front and 48 rear is correct for tire pressure. If you were running less than that cupping will be a big problem.

Brian Ley
WA State of mindless sheep
USA where everything is illegal
2007 K1200GT
2010 650GS
2000 k1200LT Sold but not forgotten
BMWOA 119892
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post #3 of 12 Old Sep 11th, 2007, 10:19 am
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Quote:
Originally Posted by sanjaun2
... but I am sure the proper radial is just fine.
I'm sure T.J. would say "Are you a tire engineer?" According to him, as the 020 radial heated up, its section width would expand and could come in contact with the swing arm. The Bias ply doesn't suffer from this because of the a different cap ply used in its construction.

The LT is designed for either bias of radial tires.

Avon make a set of radials for the LT. I've used Avon fronts with excellent results in the past. I've got the new Avons on now but am waiting for a warranty replacement for a bad front, so I'll postpone judgment on them for now. Although I will say they have outstanding tech support.

I got the PowerPoint Presentation the T'J. gave at CCR and uploaded it to the files section here.

Malcolm McGee
Little Rock, AR
'00 K1200LTC Canyon Red
'09 Kawasaki KLR 650
'96 Bunkhouse
IBA #24557
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post #4 of 12 Old Sep 11th, 2007, 11:38 am Thread Starter
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Thanks for the input

I just orderd two new tires as per TJs reply and will see if they will stand up better or not then what was put on the bike in Vegas. If I get the same result I will have to look at trying something else. it sure is nice though to have such a quick reply from a supplier.
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post #5 of 12 Old Sep 11th, 2007, 12:26 pm
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Guys,
Be gentle with me on this question, but I just don't know. With a recommended tire pressure, is that warm or cold? If you check it cold, what will the difference be when the tire is warmed up? Thanks.

Life happens...you control your reaction.

2018 Honda CRF250L Rally (fun in the woods)
2015 R1200 RT (holy cowwhat a bike)
2007 K1200 LT (sold)
2005 DR 650 (sold)
2002 Harley Ultra (sold)
1999 Harley Road King (sold)
1996 K1100 LT (sold)
1990 Honda Shadow (sold)
1978-1993 Raising Kids; Paying Mortgages
1975 Honda CB550 (sold but wish I still had)
Homemade Motor Bike (mounted a 3.5 HP Briggs & Stratton on my bicycle at age 12)
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post #6 of 12 Old Sep 11th, 2007, 1:03 pm
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Check the pressure cold. The difference will be the number, (probbaly higher but it dosn't matter, check it cold).

Malcolm McGee
Little Rock, AR
'00 K1200LTC Canyon Red
'09 Kawasaki KLR 650
'96 Bunkhouse
IBA #24557
BMWMOA #117769


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post #7 of 12 Old Sep 11th, 2007, 9:21 pm
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Quote:
Originally Posted by mrmagoo
Letter to Bridgestone

Norris "T.J." Tennent

Engineering Product Manager/Motorcycle, ATV, Kart, Fuzion

Bridgestone Firestone North American Tire, LLC

(615) 937-3591

www.motorcycle-karttires.com
Did he have an email address? Just took off a set of BT020's Radials and looks like I have a side wall separation. I guess I just changed them in time.

Garry

Follow my South America ride at
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IBAID 26718
BMWMOA 117552
2011 K1600GTL RECEIVED April 30th, 2011 @ 1:30 pm
2012 RED KLR650


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post #8 of 12 Old Sep 11th, 2007, 10:16 pm
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We've proven that the BT020 radials were not a good choice for the LT and it's heavy load on the tires.

I got 10K from the front BT020 bias tire.
Put a new metzler on it at CCR cause it was just getting too noisy from cupping. I'm not religious about tire pressure and thought I got a good life out of it at 10K

The rear is still on but it is also cupping. I'll probably change it next spring.


The V rating is what you need to be looking for. It's a LOAD rating. The Z rated tires are not good enough for the LT's big a$$.

I think you'll be very happy with the bias BT020's I was.

John

Live and direct from the new earthquake capitol of the U.S. Jones, Oklahoma
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03 R1200CLC Capri Blue "Flipper"
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post #9 of 12 Old Sep 11th, 2007, 11:18 pm
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No, we haven't "proven" that Radials are bad for the LT. The Radial tires do have to be load rated for the LT, but many of us have put on tens of thousands of miles with Radials on the LT, some of us more than 100K miles each.

Bias tires do have some advantages, but they also have some disadvantages. Each rider needs to choose for himself based on his own balance of comfort, safety, grip, and tread life. That's why we have choices in the first place.

Ken
Pacific NorthWet
'13 Dark Graphite Metallic K16GTLD, 24K miles
'09 Magnesium Beige Metallic K13GT, 63K miles
'03 Anthracite Metallic K12LTC, 66K miles
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#143, IBA# 366, MOA# 111996, SCMA# 24032


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post #10 of 12 Old Sep 12th, 2007, 7:30 pm
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Quote:
Originally Posted by zaphod
Check the pressure cold. The difference will be the number, (probbaly higher but it dosn't matter, check it cold).
Thanks, Malcolm.

Life happens...you control your reaction.

2018 Honda CRF250L Rally (fun in the woods)
2015 R1200 RT (holy cowwhat a bike)
2007 K1200 LT (sold)
2005 DR 650 (sold)
2002 Harley Ultra (sold)
1999 Harley Road King (sold)
1996 K1100 LT (sold)
1990 Honda Shadow (sold)
1978-1993 Raising Kids; Paying Mortgages
1975 Honda CB550 (sold but wish I still had)
Homemade Motor Bike (mounted a 3.5 HP Briggs & Stratton on my bicycle at age 12)
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post #11 of 12 Old Sep 13th, 2007, 11:53 am
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Quote:
Originally Posted by JPSpen
The V rating is what you need to be looking for. It's a LOAD rating. The Z rated tires are not good enough for the LT's big a$$.
The letter "V", "Z", etc. is the speed rating, 149mph and >149mph in this case. The load index (rating) is the two digit numeric, 79 = 963 lbs for the big girl. Looking through the Metzeler catalog there are "V" rated 880's with as low as a "69" load index or 716 lbs.

TJ's Powerpoint has a couple of charts on this too.

Motor On ,/'


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post #12 of 12 Old Sep 13th, 2007, 12:56 pm
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Quote:
Originally Posted by garry_kramer
Did he have an email address? Just took off a set of BT020's Radials and looks like I have a side wall separation. I guess I just changed them in time.

Garry

Malcolm McGee
Little Rock, AR
'00 K1200LTC Canyon Red
'09 Kawasaki KLR 650
'96 Bunkhouse
IBA #24557
BMWMOA #117769


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