Ton up SR250: 100mph, 100kg, 30hp

JadusMotorcycleParts

Over 1,000 Posts
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Asides from the speed sensor bracket, the last parts I want to get right for the bike are the mirrors, which are a bit of a side project in themselves. I have been thinking that if I get them right I may want to make a production run of them. The plan was to make the smallest mirrors possible that are still usable - this is how I landed on a 50mm diameter. I tested both flat mirrors and convex. The idea was to be able to mount them on stock brake lever perches and use them as 'underarm' mirrors. After a whole lot of testing and prototyping (mostly fails), I quickly realised that this was just never going to work and it's no surprise no other manufacturer does this. No matter how wide your bars are, or narrow your body is, you just can get a decent view behind you looking under your arm and down the side of your body. Check out a few of the different mounts I tried to get them to work! haha. I am happy with the mirror design itself, it allows for a lot of adjustment in the ball joint. It is just the mounting/placement of the mirror I need to sort... and it is looking like bar end mounting is the only option to be able to see anything behind the bike, even though bar end mounting was the last thing I wanted to do.
 

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gt alex

Been Around the Block
Asides from the speed sensor bracket, the last parts I want to get right for the bike are the mirrors, which are a bit of a side project in themselves. I have been thinking that if I get them right I may want to make a production run of them. The plan was to make the smallest mirrors possible that are still usable - this is how I landed on a 50mm diameter. I tested both flat mirrors and convex. The idea was to be able to mount them on stock brake lever perches and use them as 'underarm' mirrors. After a whole lot of testing and prototyping (mostly fails), I quickly realised that this was just never going to work and it's no surprise no other manufacturer does this. No matter how wide your bars are, or narrow your body is, you just can get a decent view behind you looking under your arm and down the side of your body. Check out a few of the different mounts I tried to get them to work! haha. I am happy with the mirror design itself, it allows for a lot of adjustment in the ball joint. It is just the mounting/placement of the mirror I need to sort... and it is looking like bar end mounting is the only option to be able to see anything behind the bike, even though bar end mounting was the last thing I wanted to do.
Some good testing going on there. I had some convex 60mm bar ends I found good but ended up getting some legal e-marked mirrors just trying not to draw the wrong type of attention.
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
Some good testing going on there. I had some convex 60mm bar ends I found good but ended up getting some legal e-marked mirrors just trying not to draw the wrong type of attention.
Probably a good call! I think the E-marked mirrors, at least in Europe need to be a whopping 90mm in diameter or corresponding area.
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
From previous post: 'and it is looking like bar end mounting is the only option to be able to see anything behind the bike, even though bar end mounting was the last thing I wanted to do.'

And this is where I am at... Will most likely order some machined aluminium prototypes shortly. Seems to look pretty ok and works quite well - a decent field of vision behind!
 

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JerryAssburger

Been Around the Block
From previous post: 'and it is looking like bar end mounting is the only option to be able to see anything behind the bike, even though bar end mounting was the last thing I wanted to do.'

And this is where I am at... Will most likely order some machined aluminium prototypes shortly. Seems to look pretty ok and works quite well - a decent field of vision behind!
I'm probably one of the very few who like the look of the "Snail Eyes", but I've always wanted to mess with bar-end mirrors also. Hope those work for you.
Regarding the weight issue, the only thing I can imagine that could be further pared or whittled on would be the rims/tires. The engine, which is obviously essential, and the heaviest, really can't be messed with. I weighed my very stripped down and incomplete "thing" and it came out to 220lb/100kg as it sits. This is with it still awaiting battery, tank, lights, muffler and fenders. (When I cut off the rear subframe, I was shocked at how light it was.)
So, with you getting your bike down to 115.5kg, that's pretty much the practical limit for it to retain its identity as a good-looking SR250! Pat yourself on the back! May I also THANK YOU profusely for the incredible side-on pix you've posted of your stockers- it REALLY has helped me "lay out" what I want to do without actually hacking away on the corpse.
 

JadusMotorcycleParts

Over 1,000 Posts
DTT SUPPORTER
I'm probably one of the very few who like the look of the "Snail Eyes", but I've always wanted to mess with bar-end mirrors also. Hope those work for you.
Regarding the weight issue, the only thing I can imagine that could be further pared or whittled on would be the rims/tires. The engine, which is obviously essential, and the heaviest, really can't be messed with. I weighed my very stripped down and incomplete "thing" and it came out to 220lb/100kg as it sits. This is with it still awaiting battery, tank, lights, muffler and fenders. (When I cut off the rear subframe, I was shocked at how light it was.)
So, with you getting your bike down to 115.5kg, that's pretty much the practical limit for it to retain its identity as a good-looking SR250! Pat yourself on the back! May I also THANK YOU profusely for the incredible side-on pix you've posted of your stockers- it REALLY has helped me "lay out" what I want to do without actually hacking away on the corpse.
Thanks, let's see how the billet prototypes come out!

I agree with you on the wheels. The wheels that I build up were on a couple hundred grams lighter than the stock ones, so there is absolutely an opportunity there to reduce weight. Thanks for weighing your bike, it is nice to have another reference!

Haha no probs, side profile pics of bikes is where it's at!
 

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