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Don't forget the 0.01mm inverse spacer to take it down to 1.49mm

Was planning on using the three 0.004mm ones I've got and then adding an inverse shimmed 0.0002mm spacer to counterset it slightly to the west.

I'm building a wheel on a fixed / free flip-flop hub. One side will be a Shimano freewheel and the other a Surley / Andel fixed sprocket.

Looking at Sheldon Browns table for those sprockets, I'm going to have a few mm difference between the two side.

from http://www.sheldonbrown.com/chainline.html

Chainline
(From Shoulder) for 3/32 sprockets
Surly = 6.4mm
Shimano = 7.89mm

so that's 1.49 mm difference.

Trying to sort chainline so that it is good for both sides and havea few options.

** Option one* is to move the axle and dish the wheel very slightly so it sits centre in the frame and also places the sprockets same distance from the lockring nuts, hopefully with a good chainline to match chainring, or I'll need to adjust chainring too. This seems quite a convoluted method and if I then change either sprocket fro another brand with a different shoulder I have to go through the process of redishing again to line eveything up.

**** Option two*** is to put 1.49mm or near as possible of spacers behind the Surly side and then adjust front chainring out to keep in line. Only concern about this is moving the sprocket away from the centre of the hub might bring it too near or over the edge of the thread? Is this normal. This solution does seem simpler though and more easily adjustable in the future for swapping sprockets.

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• Option three*** is to just not bother with trying to get them the same and set it all up for perfect chainline for the fixed side (which will need tighter chain and therefore benefit from being perfect more) and run the freewheel side 1.49mm out of line.
  
  

**** Option four*** is to set it up so they're both 0.75mm out, and go for something in the middle. Doesn't sound great through as it wil never be perfect.

Hoping that those figures on Sheldon's site are correct too as looking at the hub with the Shimano it actully looks like it's going to sit more like 4mm further out, which would bring the Surly sprocket option 2 even nearer or further over the fixed thread edge to match up.

Going for 3/32 chain as I may need it to be more forgiving.

Anyone been through this, have advice and experience or any other solution?

Anyone running wider tyres on road rims? Rigida DP18s should use 18 to 25 tyres for the width of rim, but have read and heard that people do run slightly wider tyres with no problems.

Anyone doing this? Any pitfalls / advice?

Looking to put a 700c 28 on A rigida DP18 instead of a 23 or 25.

Had someone just scream at me out of a car window once. Didn't even throw anything . Just screaming made me jump and nearly fall off at speed . They too didn't realise that they were just approaching a long queue at red lights. They didn't even bother to wind their window up as I pulled up to them. They just sat there trying to pretend it wasn't them. I just said "pardon" and rolled past. I think if I'd stopped they'd have been happy with a confrontation.

Just get a derailleur. That's how they evolved...

Or rollerskates

not a clue....
didnt even know they existed
but youd prob need some sought of spring tensioner
i have wondered if they were possible to find tho....

I was thinking of > White Industries DOS Dual Single Speed Freewheel
at top of page here > http://www.charliethebikemonger.com/userimages/procart5.htm

Two sprockets together and two chainrings that equal same length chain but different rations, similar to Sheldon's calculations.

Likley to be 47mm to 57mm drop but might be longer. Measure the forks to the rim or the brake that is already on there.

http://sheldonbrown.com/gloss_ra-e.html#reach

Lightening fast response. Thanks all. I know it's going to take a bit of playing about to get it set up. At least I know I shouldn't be wasting money now getting decent sprockets straight away rather than trying it out with cheapos.

Looking at dropouts they're 40mm long, but proably with more realistic movement of 35mm back and forward keeping in mind the slight angle of them.

Good to know I can probably use 17t (I've worked out I'm most comfortable with that for commuting) and not have to go for 18t fixed with limited skid patches and more wear. 19t would be ideal.

Thanks again.

I'm going to be running a 48t chainring with a 17t freewheel on a flip flop hub and wondered if anyone knows how much difference you can get away with in size for the sprocket on the other side of the hub.

I know it depends partly on the length of the dropouts and the amount of adjustment you can make to get good chain tension, but is the idea of running 17t one side and 19t the other realistic. Lookinng at the gear inches these give there seems to be a substantial difference. Maybe too much to expect to be able to account for by moving the wheel in the dropouts.

Anybody running a 17t and 19t on a flip flop hub or have any experience of it working / not working.

I'm going to measure the length of the dropouts to get a better idea. From memory they're fairly regular old racer frame droputs, possibly 1.5 to 2 inches in length.

Thanks in advance for any help, advice, suggestions.

but then what about the tension to the chain when you change the gearing?

Doesn't this come with some sort of strange chain ring (or cranks) for dealing with the chain difference issue?

"Track Ends" . They're not really dropouts.

Make it easier to get wheel in and out and adjust position. With horizontal droputs you have to push the wheel forwards to get it out, which can involved it getting wedged in / up against the frame.

"More ice-creams sold since less people use the tube. Experts say it's because pedestrians are more likely to walk by an ice-cream van and think "mmm ice-cream" than someone on the tube"

Publish that and before you know it someone will make the connection to increased obesity levels and the strain it will put on the NHS. Couple that with more articles under the supervision of an editor that doesn't want to alienate the last substantial advertising revenue they seem to have left in print media, car adverts, and before you know it everyone is absorbing flawed and skewed "information" as they dribble cornflakes down their chin in the morning, scanning "newspapers" through bleary eyes. Oh look and here's an article that mentions cyclists and terrorism. "Cyclists... terrorism... cyclists... terrorism. Remember to store that away in the subconcious now brain and keep the association between the two".

Half an hour later they can leave the house and jump in their 4x4 safe in the knowledge that the media has just reinforced their belief that they have chosen the correct mode of transport. 2 hours of sitting on Battersea Bridge later and the frustration levels are just about perfect for not putting up with any crap from those evil cyclists. Why should they give them room on the road when they know from the "information" they recieve through the media that cyclists are bad. Bad as in really bad, or bad by association. Either way it's all negative.

It wouldn't be so bad if there was an upside to the knowledge and information this sort of thing spreads, but there doesn't seem to be.

about seat belts becoming compulsory?

http://www.bbc.co.uk/iplayer/radio/bbc_radio_four/2009-09-07

The article is purposefuly obtuse and intentionaly incendiary, with the intention of generating attention to the article rather than the subject matter. The study may be sound, but the article is merely a measure of how desperate media is getting to retain readership and cling to plummeting advertising rates.

There may be a few facts in there but how relevant are they to anything?

There's a lot of this type of "journalism" around.

The Bristol Evening Post is constantly publishing articles to wind people up. They get linked to a lot and receive hundreds of comments as people argue with each other. This equals lots of hits, which equals justification of advertising rates.

I can't count the number of times I've come downstairs in the morning and my bike has jumped out at me and tried to kill me.

jesus, what about cars?

you might be on to something there

“But if you asked which killed more people in the last 10 years in London, international terrorism, or bicycles, the answer would definitely be bicycles"

And other really badly worded statements based on seriously flawed and flimsy "research"...

http://www.telegraph.co.uk/health/healthnews/6128325/77-London-bombings-may-have-resulted-in-second-wave-of-casualties-on-the-roads.html

and from Moving Target / Buffalo Bill...

http://www.movingtargetzine.com/article/psychologist-stands-by-his-statement

"This photo is private.

                                        Oops! You don't have permission to view this photo.

Do you have a stall at the bike jumble in Bristol tomorrow?

If it happened at all frequently, I'd love to carry a cheque book around to whip out (like my cock) and pay their magical fairy road tax.. that'd fuck 'em..

Vehicle Weight.. so that works out to.. oh.. 0.0045 of a pence.

writing a cheque for 0.0p as it's zero / low emissions, same as some cars eg. Toyota Prius (which is actually a scam of a car and does have emission and fairly poor mileage)

Or get some bars slotted on to the allen key or spanner (if they'll fit) for more leverage.

Rode across town yesterday with a bike bunjeed to my backpack and strapped in through the belt straps and compression straps running the wrong way round the bag so they'd go though the frame from lots of different angles. Worked fine. Good way to get traffic to give you space. Just make sure you remember it's there and go wide of everything.

Frame over the shoulder can get very painful very quickly if you don't use loads of padding. More than you think you need.

Point out that it's Vehicle Excise Duty and it isn't spent on the roads. It goes into a big government pot and is just as likely to be spent on dropping bombs on innocent citizens in Iraq. Then tell them "well done for funding the bombing of innnocent people".

Best realistic option is to ignore them or laugh.

As we've found out from trying to follow up from this unresolved incident, "tfl are not liable for any damages caused by taxi driver, who are self employed" and will fob you off with a cut and paste response of you contact them about incidents, but they do have the power to issue or remove licenses.

such a response....

*Thank you for your email dated 22 July 2009.

I must explain that the Public Carriage Office can only deal with offences that are contrary to the Hackney Carriage Acts and Orders. Under the circumstances you describe, we are unable to take any action against the taxi driver involved.

The Public Carriage Office has no legislative power to investigate road traffic offences, such as dangerous driving, damage to vehicles or failing to stop after an accident, committed by cab drivers. I can only advise you that you should follow the advice given by the Police and report the matter in person to the nearest police station.

Whilst I recognise that the police have many responsibilities placed upon them, the fact remains that they are the only authority that can investigate the road traffic offences that you describe. In any event that action is taken, for example by way of a conviction this will result in the taxi driver’s fitness to remain licensed being reviewed by the Licensing Authority.

I must further clarify that the Public Carriage Office is the licensing authority for taxi drivers, and is not liable for any damages caused by taxi driver, who are self employed. Such issues are civil matters between you and the taxi driver and could be pursued through the courts.

I am sorry that you had reason to complain in respect of a licensed cab driver and wish to thank you for bringing this matter to our attention. The incident has been noted on our records.

Kind regards

Mr Dimitris Phanos
Complaints Support.

Phone 020 7126 3152
*

Always signal turning right, often pointing too with arm very straight out if in busy traffic. I've had too many people overtaking as I turn right to take chances anymore.

Often find eye contact over your shoulder has way more effect though.

Sometimes signal left but not always.

Making long movements to overtake parked cars for example instead of sudden last minute swerves also gives drivers a clearer idea of what you're doing.

I learnt the slowing down signal when I did Cycling Proficiency at school in the eighties. I was actually told not to use it now though by a cycling inststuctor recently. She claimed it's out of date, not many people understand it and more people will be confused by it than understand.

*" Last month a "rule" was brought in that there could not be more than 3 bikes on any train, even if there were more than 3 bike racks. This is apparently so the provision will be the same on all trains, and the newer trains only have 3 racks. "

*^ From the recent incident where a fourth cyclist was removed from a train at Bristol Temple Meads and held by riot police ...

http://greenbristolblog.blogspot.com/2009/07/cycling-city-police-haul-cyclist-off.html

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