shirakawaa
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- Japan

I don't know if other people noticed it too, but the custom gear ratio screen has a serious bug carried over since GT4. This extremely annoying issue prevents to fully customize gears by limiting the possible ratio range for each gear. This behavior does not appear to be an intentional choice by PD, and I think it's the "UI issue" that prevented PD to make it appear at launch. Problem, though, is that it hasn't been corrected. A real example of lazy programming by PD.
Here's an example, using a fully tuned Daihatsu Midget II
(notice that each time the max speed setting is changed, not only gear values change, but also the allowable minimum and maximum values)* Select "Reset to default default"
With Max speed 120 - first gear range: 2.796-3.739
With Max speed 130 - first gear range: 2.615-3.504
With Max speed 140 - first gear range: 2.460-3.302
With Max speed 150 - first gear range: 2.326-3.129
With Max speed 160 - first gear range: 2.210-2.978
With Max speed 170 - first gear range: 2.107-2.845
Change Max speed from 200 to 190, then back to 200 - fifth gear range: 0.533-0.716* Select "Reset to default"
Change "Max speed" to 200 - fifth gear range: 0.546-0.734
Change Final gear to 6.000 - fifth gear range: 0.546-0.734 (still the same)
The allowed range has changed. This is due to having changed "final gear" as well while selecting different "Max speed" settings. This is actually exploitable to select values normally not possible (due to this bug). For example:
By exploiting this we can have a long first gear (racing gearboxes in real life usually have one in order to have other gears close together):* Select "Reset to default"
Max Speed: 220 - fifth gear range: 0.496-0.668
Final Gear: 3.500
Max speed: 220->200->220 - fifth gear range: 0.832-1.119
Conclusion: the serious UI issues in the gear ratio screen carried over since GT4 have not been resolved yet. My opinion is that PD enabled custom gear selection due to public outrage (since it was disabled at launch) without probably even attempting to fix it. Not only this, but the gear chart is bugged too, showing overlapping gears where it shouldn't.* Select "Reset to default"
Max Speed: 300
Final Gear: 6.500
Max Speed 300->290->300
First gear range: 1.272-1.768 (this is high enough to have a tall first gear and an acceptable top speed)
Even I could make something more usuable and technically correct in Java (really! I have attached it to this post in case you want to try) :

I guess PD simply don't care.