2018 Aprilia RS4 50 Euro 4 Upgrade Project

[Berkeley]

Thanks!!! Maybe tora ??? Lol but want them to look slightly different.
I've got some mods to do on the V4 first .....seat cover, SC project exhaust & mapping , tinted windscreen, tank pads, carbon ducts,huggers,guards etc.. maybe a ttx onlins shock.
Just did the wheel decals, tail tidy and risoma sequential indicators to the rear.

For the RS4 Its just the front sprocket, ohlins shock and for shits and giggles some carbon wheels.... but i think that's OTT.

Btw I did upgrade the horn on the v4 to the denali one which sounds much deeper.. However amaya still had the fog horn on the rs4 which out does mine still lol.

[Berkeley]

Made a few more tweaks to the exhaust to get to fit better .. mainly cutting and grinding brackets to fit.

I replaced the 14 front sprocket with a 15 and took her out for a spin.. due to traffic i got her up to 98 km/h with still a gear to go so I know it is an improvement from before so finally speed wise the bike is in a good place now!

[Berkeley]

Took it out again and hit 111 km/h, it felt that there was some more in her and maybe could change to a 15/52 sprocket.. but this I feel would impact the acceleration and not worth it for the roads around here as there are lots of twisties. The bike would never accelerate quick enough before you would have to slow down for a corner to be going faster than the top speed anyway.. So ill leave as is

[toratora]

You absolutely should try a 15 toothed front sprocket. In addition to greater top speed it also has the tendency to smooth things out. Outside super tight uphill corners I doubt that you’ll find acceleration much of an issue.

[Berkeley]

Hi tora ,yes I did change to a 15 but still have the 53 on the rear end.. should I change this to a 52? Thanks

[toratora]

On my bikes that come with 52s I leave them, on the bikes with 53s I leave them. The only time I do change them is when I happen to receive an aluminum sprocket. One tooth difference in the rear on a street bikes usually isn’t enough of a change to matter.

[kaldis12]

To help you out, about 3 rear sprocket size is equals to 1 front. Soo 15-53 is equals to 14-50 and so on.

Just to pin this, this is not a rule, this is a rounded off number. The reality is off a bit, but not by too much.

[Berkeley]

Ok great guys, thanks for the input

So if I were to up gear then the best advice is to leave the rear one alone at 53 but then change to a 16 to have better upgearing efficiency? In the past only a 15 was mentioned as I think I started originally with an 11 for the front or is 15 the limit for it?

Cheers guys

[toratora]

I would think that it would have trouble pulling a 16. The only bike I ever did that on was the one in Japan where I fitted the 100cc 2Fast Mega Ultra Performance Action.

[jkv357]

To see the effects of changing your gearing, enter your info into the calculator here - https://www.gearingcommander.com/

That way you can compare the changes you are considering before buying parts..

You can use the standard data, or adjust it for a modified cycle, then compare it to stock.

Pretty handy when you get it set-up.