Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


Will it make much difference?

 Reply to topic
Bike Chat Forums Index -> General Bike Chat
View previous topic : View next topic  
Author Message

Dan
Brolly Dolly



Joined: 04 Feb 2002
Karma :
PostPosted: 22:04 - 20 May 2002    Post subject: Will it make much difference? Reply with quote
i'm going to be getting a new set of chain and sproket soon and i want to DOWN gear my bike by puting a 12 tooth sproket on the front, can u tell me will it make much difference to the exeleration? or shall i just keep with the standard?
also do u know n e sites i can order these from?
cheers

dan Rolling Eyes
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Scooby
Scrappy Doo



Joined: 26 Mar 2002
Karma :
PostPosted: 22:06 - 20 May 2002    Post subject: Reply with quote
I think it would make you bike accelerate faster, but I think the sprockets would wear faster??? I dunno if I am right, wait for some techie like Keith to reply before you do it..... hehe Laughing
____________________
A big enough hammer fixes anything!
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 22:54 - 20 May 2002    Post subject: Reply with quote
Hi

You will loose about 7% off your top speed. Acceleration will be better off the line, but not really sure how much. The chain will wear out quicker, but not that much worse really. You will get much the same effect by fitting about a 3 tooth larger rear sprocket, without the chain wear problems

All the best

Keith
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Dan
Brolly Dolly



Joined: 04 Feb 2002
Karma :
PostPosted: 23:07 - 20 May 2002    Post subject: 1 Reply with quote
so if i got a bigger back sproket it will have exactly the same effect? i dont really need my top end over here, seing as the speed limit is 40 mph max! lol
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 23:18 - 20 May 2002    Post subject: Reply with quote
Hi

The gearing is determined by the size of the front sprocket compared to the rear sprocket.

Standard us 13/35, which is 0.37. You suggested to go to 12/35 which is 0.34, which would be the same as going for 13/38.

Only down sides are that the unsprung weight is marginally more (but the difference will be so small to be irrelevant) and that you will need a slightly longer chain which will cost a quid or so more.

All the best

Keith
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Dan
Brolly Dolly



Joined: 04 Feb 2002
Karma :
PostPosted: 23:27 - 20 May 2002    Post subject: 1 Reply with quote
so it wont really make much difference what i do? but it would be better to get a bigger back one (38?) cos it do'nt wear the chain as much?
also what do u mean bout the weight thing?
how much should i be paying for the set? roughly?
cheers keth your a lege Laughing
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

retrofly
World Chat Champion



Joined: 11 Feb 2002
Karma :
PostPosted: 07:48 - 21 May 2002    Post subject: Reply with quote
Hi
dont know about u but i dont have a scoobies Confused

Luke
____________________
"The food was not undelicious"
-Homer Simpson (Exceptional beast : Underachiving Human)
www.geocities.com/retrofly
 Back to top
View user's profile Send private message Send e-mail Visit poster's website You must be logged in to rate posts

Kickstart
The Oracle



Joined: 04 Feb 2002
Karma :
PostPosted: 19:12 - 21 May 2002    Post subject: Re: 1 Reply with quote
Dan wrote:
so it wont really make much difference what i do? but it would be better to get a bigger back one (38?) cos it do'nt wear the chain as much?
also what do u mean bout the weight thing?
how much should i be paying for the set? roughly?
cheers keth your a lege :lol:


Hi

Acceleration will be better, but by the time the clutch is out and you are revving hard then it will make no difference. It will be better for trying to do hill starts at a reasonable speed without lots of noise.

As to the weight. To give suspension an easier time, so that it can do its job properly, you want to maximise the ratio of sprung weight to unsprung weight. Bascially the heavier the unsprung parts of the bike (wheels, brakes, tyres, etc) the more inclined it is to just keep going straight along rather than following the bumps in the road (ie, the wheels will spend time off the ground). The extra weight of a few links of the chain are neither here nor there.

A smaller front sprocket means that the teeth spin faster and spend more time in contact with the chain and thus wearing. Added to which the chain is having to turn more tightly, and is thus accelerating (ie , centrepedal / centrafugal force). And on some bikes (Bimota BB1) you land up with the chain touching the swinging arm!

All the best

Keith
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Dan
Brolly Dolly



Joined: 04 Feb 2002
Karma :
PostPosted: 22:14 - 21 May 2002    Post subject: 1 Reply with quote
i went down to the bike shop today, i can get a nice gold rethal chain for £45 quid and the sprokets for £20 odd i think he said. sounds good to me. i think i will go with the smaller front, i will have to see what difference it makes, cheers keth
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
Old Thread Alert!

The last post was made 23 years, 215 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> General Bike Chat All times are GMT
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 
Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.07 Sec - Server Load: 0.51 - MySQL Queries: 16 - Page Size: 63.49 Kb