tag:blogger.com,1999:blog-18899086.post6752506676784849608..comments2023-10-07T07:28:55.729-04:00Comments on Dave Moulton's Bike Blog: TwiddlingDave Moultonhttp://www.blogger.com/profile/07556183205157714280noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-18899086.post-38209517249661083902008-06-04T04:08:00.000-04:002008-06-04T04:08:00.000-04:00A fascinating article. Newspaper clip: Brian Sande...A fascinating article. Newspaper clip: Brian Sanderson was my dad's cousin, and Keith Potter was a close family friend. Sadly neither are with us any more. My dad, Frank White was well known for winning hoards of silverware with Luton Arrow CC and also Icknield RC!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-30535511074363666962008-01-04T19:34:00.000-05:002008-01-04T19:34:00.000-05:00I'm planning to ride some TTs on a fixed bike in t...I'm planning to ride some TTs on a fixed bike in the uk later this year. This has been very helpful. I ride a 42-16 evcery day. My LBS has suggested a 46-14 combo for short and relatively flat TTs, I'm not sure if that's appropriate. <BR/><BR/>Ref the carrier: presumably the nuts on the spare wheel spindles are lossley fitted if at all or the wheels would turn with the front?Balfhttps://www.blogger.com/profile/18045962063759667836noreply@blogger.comtag:blogger.com,1999:blog-18899086.post-18175085170166037692007-11-29T19:46:00.000-05:002007-11-29T19:46:00.000-05:00Tejvan Pettinger said... "It's hard to imagine a 1...Tejvan Pettinger said... <BR/>"It's hard to imagine a 1.10.00 winning a 25 mile these days. With traffic levels and modern technology winning times are more likely to be 52s and 52s. Top guys will do a few 49s and 48s."<BR/><BR/>Tejvan,<BR/>Did you get the part about the fixed gear? What I wonder is how fast would one have to "twiddle" to ride 52 on a 48 x 18 fixed gear? Totally agree on the traffic free roads.<BR/><BR/>Dave, love the historical stuff. Thanks so much.<BR/><BR/>Cheers, Gene in TacomaAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-5545218023175127102007-11-29T08:30:00.000-05:002007-11-29T08:30:00.000-05:00It's hard to imagine a 1.10.00 winning a 25 mile t...It's hard to imagine a 1.10.00 winning a 25 mile these days. With traffic levels and modern technology winning times are more likely to be 52s and 52s. Top guys will do a few 49s and 48s.<BR/><BR/>Mind you, I'd swap it all to race on traffic free roads.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-2695065387041522512007-11-28T00:19:00.000-05:002007-11-28T00:19:00.000-05:00Interesting post. Thats some memories from back th...Interesting post. Thats some memories from back there. Its a rare sight to see fixed gear TT's nowadays. The whole twiddling concept dashed my notion that in the early days, racers pushed for heavier gears and lower rpm's that today's high rpm blitz speeds popularized by Armstrong and Contador and all. <BR/><BR/>I think I'd like the idea of plugging my bottles near my handlebars on climbs. Neat idea. The 'shave off every gram of drag' approach has certainly buried some early age conveniences.Ron Georgehttps://www.blogger.com/profile/18394865788996482667noreply@blogger.comtag:blogger.com,1999:blog-18899086.post-24204105130324429962007-11-27T12:44:00.000-05:002007-11-27T12:44:00.000-05:00A 27 inch wheel divide by an 18 tooth sprocket, ti...A 27 inch wheel divide by an 18 tooth sprocket, times a 48 tooth chainwheel = 72 inch gear.<BR/><BR/>A 72 inch gear is the equivalent of the distance covered by one revolution of a wheel 72 inches in diameter. This dates back to the “Ordinary” or “Penny Farthing” bicycle.<BR/><BR/>The circumference of a 72 inch wheel is 72 x 3.14 = 226.08 inches which is 18.84 feet. The chalk marks for checking the gear would be 18.84 feet apart if the crank did at least one revolution within these marks the gear was no higher than 72 inches.<BR/><BR/>A bicycle wheel is actually less than 27 inches, about 26.5 inches by today’s standard. Back in the 1950s when tires were fatter nearer 26.75 which is 7.003 feet circumference. The wheel turns 2.666 revolutions per one revolution of the crank, because it is geared up by 48 to 18. <BR/><BR/>7.003 feet x 2.666 = 18.67 feet traveled per pedal revolution, which falls within the 18.84 feet chalk marks. It is slightly less because the wheel is not a true 27 inch. If you do the math for a true 27 inch wheel it will come out at 18.84.<BR/><BR/>DaveDave Moultonhttps://www.blogger.com/profile/07556183205157714280noreply@blogger.comtag:blogger.com,1999:blog-18899086.post-17285905028983385202007-11-27T11:32:00.000-05:002007-11-27T11:32:00.000-05:00Perhaps I'm missing something."Calculated at a nom...Perhaps I'm missing something.<BR/>"<BR/>Calculated at a nominal wheel size of 26.75 inch diameter. (7.003 feet circumference.) 48 T chainring, divide by 18 T sprocket = 2.666 turns of the rear wheel per 1 turn of the chainring. 7.003 x 2.666 = 18.67 feet traveled per pedal rev.<BR/>"<BR/><BR/>How can you travel 18.67 feet per pedal revolution?<BR/><BR/>In fact, you earlier say<BR/>"<BR/>A very popular early season event was the 72 inch restricted gear 25 mile event. All competitors rode a 48 x 18 fixed gear, which was checked at the start by wheeling the bike between two chalk marks on the road, to ensure the crank did one complete revolution.<BR/>"Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-74927265594440287752007-11-27T04:29:00.000-05:002007-11-27T04:29:00.000-05:00Colin,I appreciate your updates on what's happenin...Colin,<BR/>I appreciate your updates on what's happening today in the UK.<BR/><BR/>Maltese Falcon,<BR/>You only need 12.5 miles out, turn and ride back. All British time trials are on "out and home" courses. Today they usually make use of round-a-bouts (Traffic circles.) for turns. Not too many of those in the US.<BR/><BR/>Phelim,<BR/>"Inside evens" means beating 20 miles per hour at any distance. For example 1hour, 15 minutes for 25 miles, or 5 hours for 100 miles.<BR/>Dave.Dave Moultonhttps://www.blogger.com/profile/07556183205157714280noreply@blogger.comtag:blogger.com,1999:blog-18899086.post-16091263694282861592007-11-27T03:04:00.000-05:002007-11-27T03:04:00.000-05:00Once again a great Article Dave. What does "gettin...Once again a great Article Dave. What does "getting inside evens" mean in the Newspaper cutting?<BR/><BR/>Thanks<BR/>Phelim, BerlinAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-73100514356234308662007-11-26T23:22:00.000-05:002007-11-26T23:22:00.000-05:00Pretty kewl stuff, Dave. That would be a pretty f...Pretty kewl stuff, Dave. That would be a pretty fun event to hold today in the US, but trying to find 25 clear miles in the US would be darn near impossible.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18899086.post-1387179018989236192007-11-26T05:36:00.000-05:002007-11-26T05:36:00.000-05:00There's still a few "medium gear" events around to...There's still a few "medium gear" events around today in the UK time trial programme. I think I've still got some wheel carriers somewhere in my garage. I used to ride to the Saffron Lane stadium with my track bike on my back and wheels carried as you describe.Rich Gift Of Linshttps://www.blogger.com/profile/17868005278180471114noreply@blogger.com