Tyre sizes, Metric eqv?!

[Mr.Ormes]

Hi, I bought a new rear tyre for my DT 125. i ordered off of ebay cause im a tight arse and its the same tyre make as i allready have on the bike and i have had no problems with cornering/braking etc...
heres the link:

https://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=110653308402&ssPageName=STRK:MEWNX:IT

When the seller said 350x18 4.10 metric equiv...i assumed this means they are exactly the same size, So the tyre arives this morning and its clearly smaller than my origional, i take it to my local bike shop and ask for his advice and he said it will fit but is in no way the same....i go home, i ring the seller up, and he trys telling me it is exactly the same as a 4.10 and i can return the tyre for a refund but if he sends a 4.10 it will be exactly the same tyre.

Help please?!
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DT 125 1995
Thumpstar 120
Suzuki ZR 50

[Kickstart]

Hi

What size tyre have they sent? Think a 4.10 is a 110/90 equivalent.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Mr.Ormes]

[Kickstart]

Hi

That isn't an equivalent at all. 4.10 is referring to the size in inches, same for 3.50. So the difference is 0.6 inches, about 15mm.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[truslack]