Aspect Ratio / Tyre Height (Does it matter?)

[Uber_Beluga]

If I were to replace:

My current tyres:
80/100-21
110/90-18

with

Some new slightly shorter tyres: notice the second number (Aspect ratio, or tyre height) is chaning.
80/90-21
110/80-18


Would they fit my bike? Would they cause any problems? I understand I would be gearing myself slightly lower, but as it happens, that would actually suit me.
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DRZ400 | KLR650 | CBF 125 | DT 125 R | DT 125 re Stolen |

[jaffa90]

To my reckoning the front will be 8mm less deep and the back 11mm less, the back would feel a bit firmer but what speed rating are they?

[MCN]

It may affect the handling characteristics.

The bike may 'dive' into a turn or may need more effort to turn.

https://www.canyonchasers.net/shop/generic/tires.php

I (personally) wouldn't phaph with OEM recommendations unless for a specific and well researched purpose.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Uber_Beluga]

Speed rating on the site was around 130mph
They're for a DT125 so that should cover it

The problem is, I can't find anything suited for the road with the same specs as what is currently on the bike.

Anyway, plot twist... I did some research and it turns out that what is currently on the bike doesn't meet the OEM specs. I should have no problem finding some tyres for the OEM specs, so I'll go with that.

https://www.bikez.com/motorcycles/yamaha_dt_125_re_2004.php
https://www.bikez.com/motorcycles/yamaha_dt_125_re_2006.php
Mine is 05, so I guess it's the same as either of those.

Thanks for the help, didn't think to look at the OEM specs.
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DRZ400 | KLR650 | CBF 125 | DT 125 R | DT 125 re Stolen |