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Offline dolfanbolt

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Tires
« on: May 12, 2016, 03:21:53 am »
Had to send my front tire with someone to the dealer to be changed as something cut my tire on a ride last weekend.  The dealer said they had the tire so I sent it with a friend as I live about 200 miles away from dealer.  The wheel came back with a 120/60zr17 instead of a 120/70zr17.  It is a Michelin PR4.  When I inquired why after my friend brought wheel back, dealer said the 120/60 allows for steeper trail angle allows for more nimble turning at low speeds.  Says put shorter tire on a lot of heavy bikes rather than changing the steering geometry to accomplish this because it will not effect higher speed handling.  My thought was they did not have the right tire in stock.  Anyone have an opinion on this?  Also it seems to be filled to 51 psi.  Is this due to smaller tire or too much air? Thanks, for any thoughts.

Offline atrophy

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Re: Tires
« Reply #1 on: May 12, 2016, 03:35:42 am »
51 lbs is too much.
Either he did not have the right tire in stock or he knows way more than Triumph.
Good luck.
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Offline azgman

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Re: Tires
« Reply #2 on: May 12, 2016, 06:37:51 am »
Please find a new dealer. You deserve to be treated better than that!
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Offline Coconut

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Re: Tires
« Reply #3 on: May 12, 2016, 06:56:56 am »
Tire Size 120 / 70 ZR17 is a tire for a 17" rim, with a section width of 120mm,
and a sidewall height of 70% of the section width, which is 84mm.

Tire Size 120 / 60 ZR 17 is a tire for a 17" rim, with a section width of 120mm,
and a sidewall height of 60% of the section width which is 72mm.

So the replacement tire they fitted is 12mm lower. ( The overall diameter is 24mm less ).

I would think that this will make a noticeable difference to your ride.

It will be a matter for you to decide whether to take the matter further -
the Dealer had told you that they had the tire in stock but fitted one
that it quite different, without checking with you first, and also appear to to have overinflated it.

If you want the correct Spec. tire fitting, refer the supplier to Page 167 ( UK & On-Line version )
of the Owners Handbook ( copied below ), stressing the "WARNING" text !

Cheers  :821:


Offline Volfy

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Re: Tires
« Reply #4 on: May 12, 2016, 02:07:21 pm »
While it is true the 60 profile tire steepens rake and decrease trail, thereby making the bike easier to turn in.  But... it also can potentially make the bike less stable, especially under hard braking.

I think you're absolutely correct that your dealer did it because they didn't have the correct tire size in stock.  I would go back and demand they replace it with the correct tire.  If they give you any lip, ask them if they will take personal responsibility if - for whatever reason - your bike goes down, and some lawyer found out they installed the wrong size tire.

That said, I have , on occasions, chose to ride on different tire size than what is mfr-recommended, but that is my prerogative and mine only.  I would never let anybody else decide that for me.
« Last Edit: May 12, 2016, 02:09:29 pm by Volfy »
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Offline triucati

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Re: Tires
« Reply #5 on: May 12, 2016, 02:24:46 pm »
The 51 lbs is for mounting purposes. For this reason,  always check your pressure after mounting tires.

The 60 will work. Is it better?  Probably not. Is it dangerous?  Probably not.  Since the dealer is so far away, might want to try it.  And I would never go to that dealer again unless they apologize and make things right for you.

Offline Coconut

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Re: Tires
« Reply #6 on: May 12, 2016, 03:55:25 pm »
dolfanbolt,

Sorry I didn't pick up on this earlier -

Was this a TRIUMPH Dealer that supplied the tire, or a Tire Dealer ?


Offline dolfanbolt

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Re: Tires
« Reply #7 on: May 12, 2016, 03:59:05 pm »
It was is a Triumph Dealer