[sendler]

$25

Crappy.

This bike really would benefit from +1 on the drive sprocket. I'd plunk down the cashola on one today if it were available.

He quoted me $25 each and supposedly had them designed and cut and sent out for hardening but the whole of all of the various parts in the batch came back improperly hardened and that's where it ended.
.
Diamond Dimension is the OEM supplier of the original gears in Thailand and they make a 15T front and a 36T (down two) rear that I have seen pictures of, blister packed with printed art and everything. Definitely ready for retail sale. But I can't find anyone who can sell them to me. That set would be a few tenths of a percent longer than just changing to a 16T(already very long) in the front but would fit the stock chain slider and chain length the best.

 

[tygausa.com]

Just an FYI - front sprockets still in development, but I have all the rears in stock now.

WW

 

[stumps]

I just don't think this little 250 can handle taller gearing. Let it rpm away I say.

 

[arn]

Just an FYI - front sprockets still in development, but I have all the rears in stock now.

WW

35T? Cost (incl. shipping to India)?

The 15T front sprocket I was making came back with the wire cut not done properly - did not fit. The guy making it got so upset, he refused to take my calls any more, so I've let it be. 15T F or 35T rear, the result should be much the same.

 

[killstrelok]

Stumbled across these front sprockets 13,14&15t
HONDA CBR250R Custom Parts : Page 3

 

[sendler]

Bikers

Stumbled across these front sprockets 13,14&15t
HONDA CBR250R Custom Parts : Page 3

I might buy their 15T if I can't get one anywhere else. They have all of the parts from Bikers too. And for only 3 times the price of what they are in Thailand. Tsukigi quoted me even higher from their US office. They wanted $505 for the set back foot pegs that sell for $160 and $80 each for the $23 brake levers.

 

[arn]

Good find, but a bit pricey. There does not seem to be any other 15T available online, though for guys in Thailand, DDC (Sprockets) this might help. Their web page is not too helpful.

 

[tbarsch]

I am interested in that same set sendler (15/36). Looks like they are called "Light Speed" by Ride it. The web site to order from is PRODUCT: RIDE IT FOREVER#

 

[arn]

Cut a 35T sprocket and fitted it to the bike.

Incidentally, the stock sprocket is quite soft (less force on the teeth as compared to the front sprocket). Running about town there does not seem to be much by way of loss of pickup. I have a 3500 km trip lined up this weekend, we'll see how the longer gearing performs at cruise speeds.

The stock chain is too long for this sprocket. 109 links is about right.

For those in India, this is the Pulsar 220 chain + 1 link. In fact if one wants to increase the gearing to a slightly lower magnitude, you can use the carburetted 220's rear sprocket as a start point (36T, the FI version has 37T). However, you'll still have to do some welding and machining as the PCD for the holes is very different, and unlike the CBR the pulsar sprocket is fitted on 4 fasteners. What you get is the teeth already cut, so the only resource you need is a half decent fabrication and machining outfit prepared to do the rest of the work for you.

 

[sendler]

Siamsprocket has them

Siamsprocket can sell the ft/ rear set but shipping to the US is more than the parts.
I will also call superior this week to see if he is ever going to come through for the front spockets he has designed.
.
On Nov 6, 2011, Peerapat Wijitcharuskun <[email protected]> wrote:
Dear Scott,
The price of sprocket you request is 1750 THB per set (15T & 36T) excluding shipping charge. If you need it, please send me your address for shipping quotation.

Best Regards,
Patrick Wijit
I got quote from Postal office for EMS service. The shipping cost is 2610 THB, can you accept this cost or I have to look for some other way? Please let me know.

 

[sendler]

Cut

Superior Sprockets has my 15T and 16T sprockets cut and is working to get some other projects complete in order to fulfill the minimum quantity to send out for hardening. Still no firm promise time but I am hoping to get them on my bike before the snow pins me down so I can offer a report. Shipping for the US and Canada will obviously be much cheaper than buying from Thailand so I am going to wait.

 

[arn]

16T may have an issue of clearance - the housing does not have much space (from the shaft centre) and once the chain is placed it may almost touch the housing.

 

[Aufitt]

You must have some **** serious engine mods to be able to pull taller gearing, It wont pull the stock gearing... All manufacturers do that to pass strict ride by noise tests.
I want one more tooth on the rear and it will be perfect, and 2nd gear starts a little easier, and it will slightly close up the gaps between changes.

 

[sendler]

Slider

16T may have an issue of clearance - the housing does not have much space (from the shaft centre) and once the chain is placed it may almost touch the housing.

A 16T will clear all of the webbing but I don't know if the chain slider will still function well. Or if the stock chain will adjust in far enough to fit long enough. It is just an experiment at this point and may never even leave the garage. Up one in the front and down one or two in the rear would work better to preserve the chain length and the chain line but my US manufacturer doesn't normally make steel rear sprockets and I would wear out aluminum sprockets twice in a year with the miles that I put on. I may end up doing a group buy to get the DDC set from Thailand so I could run a 15T front and 37T rear. It sounds like a lot of gearing but it will still only drop my cruise rpm from 6,800 to 5,900.

 

[tbarsch]

DDC does offer a 15T front and 36T rear... What would that drop your rpm to?

 

[arn]

Well I'm back from a 3500km trip over the last 4 days. I got a chance to evaluate the longer gearing (35T Rear).

Firstly it messes up the speedo readings. What was a positive 6% error at 100 kph is now a negative 3% error, as compared to the GPS. 100kph (GPS) would be 106 normally, it's now 97 on the speedo, so I guess it would also correspond to a 9% error on the odometer as well, which used to correspond almost exactly with the GPS previously.

My bike was loaded with some luggage, I sat upright throughout the "testing" and did not have the fairing lowers fitted either, so the aerodynamics are definitely inferior to stock. Once the front end and the fairings are redone, there may be significant differences as to how the bike behaves at speed.

Sixth gear is now good only for cruising at 100kph and above. Acceleration seems to be less from 90 to 100 than 105 to 115, the same slopes that the bike can accelerate on at 110kph, it will have difficulty gaining speed from 95kph or less. Fifth, however is a much more usable gear and will slingshot the bike to 120kph without much hesitation. The maximum (easily attainable) speed in this configuration was 135kph GPS in 6th gear. By easily attainable I mean a speed that can be recreated easily provided there are no unfavourable conditions (slope/headwind). Holding 120kph (GPS) is no issue at all, though I preferred to cruise at 110kpg (less wind noise)

I think there will be a significant difference only once this almost naked (stock screen) configuration is given a full fairing, with a redesigned front end, the lowered drag would then take advantage of the taller gearing, as I've seen the kind of difference poor aerodynamics can make at higher speeds. But I'll have to wait for mid Jan for that.

 

[sendler]

Speedo vs odo

Well I'm back from a 3500km trip over the last 4 days. I got a chance to evaluate the longer gearing (35T Rear).

Firstly it messes up the speedo readings. What was a positive 6% error at 100 kph is now a negative 3% error, as compared to the GPS. 100kph (GPS) would be 106 normally, it's now 97 on the speedo, so I guess it would also correspond to a 9% error on the odometer as well, which used to correspond almost exactly with the GPS previously.

That's interesting that the odo used to match a gps but the speedo used to be fast compared to gps. I had always assumed that the speedo error would match the odo error but I guess this would not have to be the case. My USA version bike has been verified time and again on different stretches of road that the odo is actually 1.4% shorter than actual and compared to other traffic, and to Gearing Commander, the speedo is also 1.4% slow.

 

[prisoner881]

Well I'm back from a 3500km trip over the last 4 days. I got a chance to evaluate the longer gearing (35T Rear).

Firstly it messes up the speedo readings. What was a positive 6% error at 100 kph is now a negative 3% error, as compared to the GPS. 100kph (GPS) would be 106 normally, it's now 97 on the speedo, so I guess it would also correspond to a 9% error on the odometer as well, which used to correspond almost exactly with the GPS previously.

What tools are available to correct the speedo? If this were a car I'd have a Power Programmer do it but I don't have any such thing for bikes.

 

[arn]

I don't think it is necessary to "correct it", one just needs to be aware of what the error is. An analogy would be a watch set a few minutes fast or slow - once you know it, you know what the correct time is as well.

At least, making this sprocket has given an idea as to what we can expect with a 36T on the rear.

 

[sendler]

Loose

Bad news. Superior Sprockets has discovered another problem with the ft sprockets they were making for us. The broach they were using to form the inner splines is apparently a few thousandths too big. He is going to send me a 15T for a trial fit but fears it will be too loose. They also forgot that I had asked for a 16T to try so they never made any of those. Now I am back to hunting down an economical way to buy the 15T/ 36T set from Thailand.