18T front sprocket

[Shorty]

Anyone know where i can get an 18 Tooth front sprocket for a 2016 model. I want one for next month. Thanks in advance.

 

[Shorty]

Sorry i should have mentioned standard chain 525 i think

 

[fast_ryan]

B&C Express

www.bandcexpress.co.uk

 

[Shorty]

Re: B&C Express

Thanks , I searched tinternet for the last two hours and they never came up. I will give them a ring in the morning.

 

[Shorty]

Re: B&C Express

www.bandcexpress.co.uk

Tried them this morning and still no luck. They suspect that there may not be the clearance for an 18T.

 

[alex]

What's the reason for wanting one? You could drop to a 44T rear to make it leggier, might be easier.

 

[alex]

I checked these guys. http://www.talon-eng.co.uk/

http://finder.talon-eng.co.uk/produ...ry=front-sprockets&bikes_subcategory=standard

15-17 only.

 

[fast_ryan]

Gearing

As a rule just remember the following when making any changes to gear ratios:

Gearing a bike up to produce higher top speed with less acceleration is done using a larger front sprocket or a smaller rear sprocket.

Gearing a bike down giving it more acceleration with lower top speed is done using a smaller front sprocket or a larger rear sprocket.

Generally speaking changing one tooth on the front sprocket has a significantly larger effect on the gearing than changing one tooth on the rear sprocket. To make only a small change in gearing it is therefore necessary to change the rear sprocket size by one tooth, as changing the front sprocket makes a far larger difference in gearing.

You may not always have to reduce the number of links when altering gear ratios but bear in mind a reduction in chain length may positively, or negatively, alter wheelbase. For the 2015/16 model retaining a longer wheelbase is preferential.

 

[Shorty]

Its for a one off top speed run. I have emailed talon to see what they can do or suggest. B&C offered to machine a 42 T rear but it will take to long and i will have to shorten the chain

 

[Shorty]

Re: Gearing

Thanks. There is not the adjustment left in the chain to go down 2Teeth thats why i wanted to go up 1T at the front. its only for a one off event then back to standard.

 

[scooby]

wont take a 18t front sprocket,the 17t is uber tight as it is.

 

[stuartb]

Re: Gearing

As a rule just remember the following when making any changes to gear ratios:

Gearing a bike up to produce higher top speed with less acceleration is done using a larger front sprocket or a smaller rear sprocket.

Gearing a bike down giving it more acceleration with lower top speed is done using a smaller front sprocket or a larger rear sprocket.

Generally speaking changing one tooth on the front sprocket has a significantly larger effect on the gearing than changing one tooth on the rear sprocket. To make only a small change in gearing it is therefore necessary to change the rear sprocket size by one tooth, as changing the front sprocket makes a far larger difference in gearing.

You may not always have to reduce the number of links when altering gear ratios but bear in mind a reduction in chain length may positively, or negatively, alter wheelbase. For the 2015/16 model retaining a longer wheelbase is preferential.

Thats excellent advice...I always wondered what the difference was with altering the front v the rear.

Sent from Galaxy S7

 

[Mick753]

Re: Gearing

The rule of thumb depending on who you speak to Stuart is that taking 1 tooth off the front sprocket is like adding 2.5 teeth to the rear one (round that to 3 ) and adding 1 tooth to the front is like taking 3 off the rear.

Pretty much all the bikes I have owned have benefited from taking 1 tooth off the front sprocket for road use too (definitely the Italian bikes) as it made them easier to ride in the lower gears and revs around towns but I still ended up adding 2 teeth to the rear of most of them bikes too as I didn't need top end, with the BMW I haven't felt the need to change the gearing

 

[stuartb]

That's great Mick, I've never altered gearing, only ever replaced like for like Chain and Sprockets...