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These are the user uploaded subtitles that are being translated: 1 00:00:00,040 --> 00:00:01,640 so this is an interesting one I I get a 2 00:00:01,640 --> 00:00:02,840 lot of feedback from the people that 3 00:00:02,840 --> 00:00:05,319 I've fitted about the changes that we've 4 00:00:05,319 --> 00:00:06,759 made to their position and how it's 5 00:00:06,759 --> 00:00:08,679 affected their writing now the obvious 6 00:00:08,679 --> 00:00:10,280 ones are the sense of like the pedal 7 00:00:10,280 --> 00:00:12,559 stroke and how symmetrical it is and the 8 00:00:12,559 --> 00:00:14,040 less weight on the hands and all that 9 00:00:14,040 --> 00:00:16,920 good stuff interestingly years and years 10 00:00:16,920 --> 00:00:18,279 ago I noticed this a lot of people would 11 00:00:18,279 --> 00:00:20,080 get back to me after after we've altered 12 00:00:20,080 --> 00:00:21,560 their position and they would say mate 13 00:00:21,560 --> 00:00:24,800 the bike handles way better and they and 14 00:00:24,800 --> 00:00:26,119 I I always thought this was kind of 15 00:00:26,119 --> 00:00:27,640 unusual that what the changes that we 16 00:00:27,640 --> 00:00:29,279 were making to their position were 17 00:00:29,279 --> 00:00:31,119 having a really marked effect on their 18 00:00:31,119 --> 00:00:33,600 perception of particularly the cornering 19 00:00:33,600 --> 00:00:35,840 stability of the bike so this was a 20 00:00:35,840 --> 00:00:37,320 really common feedback that I was 21 00:00:37,320 --> 00:00:39,440 getting so I'll tell you my experience 22 00:00:39,440 --> 00:00:40,879 with this and we're talking again 23 00:00:40,879 --> 00:00:42,640 specifically about road bikes here so 24 00:00:42,640 --> 00:00:44,000 we're not talking about mountain bikes 25 00:00:44,000 --> 00:00:46,000 or gravel or track bikes or anything 26 00:00:46,000 --> 00:00:48,239 road bikes specifically so I've fitted a 27 00:00:48,239 --> 00:00:50,120 lot of people over the last 14 years and 28 00:00:50,120 --> 00:00:52,719 this is the feedback I often get so we 29 00:00:52,719 --> 00:00:54,239 I'm not going to go into detail about 30 00:00:54,239 --> 00:00:56,680 the nuances of frame geometry here this 31 00:00:56,680 --> 00:00:58,840 is the these are the three big things 32 00:00:58,840 --> 00:01:00,879 with actually frame geometry like the 33 00:01:00,879 --> 00:01:02,760 tiny little things about frame geometry 34 00:01:02,760 --> 00:01:04,040 are probably down at number four and 35 00:01:04,040 --> 00:01:07,119 five but the three big ones the single 36 00:01:07,119 --> 00:01:08,759 biggest factor that I've ever found 37 00:01:08,759 --> 00:01:10,479 which affects the handling of the bike 38 00:01:10,479 --> 00:01:12,360 is what I would call the location of 39 00:01:12,360 --> 00:01:14,759 your center of mass so what the heck is 40 00:01:14,759 --> 00:01:16,080 Center of mass now if you imagine for 41 00:01:16,080 --> 00:01:17,920 example on this bike behind me here if 42 00:01:17,920 --> 00:01:19,439 you're looking at a bike from the side 43 00:01:19,439 --> 00:01:21,920 there is an imaginary point at which if 44 00:01:21,920 --> 00:01:24,720 we flip the bike 90° onto its side and 45 00:01:24,720 --> 00:01:26,960 we put a pin there you and the you and 46 00:01:26,960 --> 00:01:28,759 the bike would balance like a spinning 47 00:01:28,759 --> 00:01:31,400 top the C CER of mass as viewed from the 48 00:01:31,400 --> 00:01:34,119 side bikes are all built with a certain 49 00:01:34,119 --> 00:01:36,040 center of mass in mind so this is this 50 00:01:36,040 --> 00:01:37,880 sort of affects your weight distribution 51 00:01:37,880 --> 00:01:39,320 more weight towards the front more 52 00:01:39,320 --> 00:01:41,439 weight towards the rear higher or lower 53 00:01:41,439 --> 00:01:43,560 Center of mass or some variation of all 54 00:01:43,560 --> 00:01:46,280 of that the center of mass is the big 55 00:01:46,280 --> 00:01:49,040 handling sort of uh determinant I guess 56 00:01:49,040 --> 00:01:51,640 you would say so the further they're 57 00:01:51,640 --> 00:01:53,200 they're all built with an ideal Center 58 00:01:53,200 --> 00:01:55,880 of mass involved in in in mind so the 59 00:01:55,880 --> 00:01:57,640 further your your center of mass tends 60 00:01:57,640 --> 00:01:59,640 to deviate away from this ideal Center 61 00:01:59,640 --> 00:02:00,399 Point 62 00:02:00,399 --> 00:02:02,920 the worse the handling gets in different 63 00:02:02,920 --> 00:02:04,600 ways so you imagine if the center of 64 00:02:04,600 --> 00:02:06,680 mass deviates forward too far you have 65 00:02:06,680 --> 00:02:08,479 too much weight on the front not enough 66 00:02:08,479 --> 00:02:10,080 weight on the rear the handling goes all 67 00:02:10,080 --> 00:02:11,640 out of whack the steering doesn't feel 68 00:02:11,640 --> 00:02:13,480 right people might have experienced this 69 00:02:13,480 --> 00:02:16,200 running like 150 mm stems and stuff on 70 00:02:16,200 --> 00:02:18,280 bikes and similarly if the center of 71 00:02:18,280 --> 00:02:20,800 mass goes too far back if you've got for 72 00:02:20,800 --> 00:02:23,040 example a person who's got really long 73 00:02:23,040 --> 00:02:25,120 femur and a really high seat height and 74 00:02:25,120 --> 00:02:26,879 they have to push the seat way back on 75 00:02:26,879 --> 00:02:29,080 the rails and have to run a short stem 76 00:02:29,080 --> 00:02:31,239 they will often feel that on a given 77 00:02:31,239 --> 00:02:33,040 bike that the handling is way more 78 00:02:33,040 --> 00:02:35,000 Twitchy and the front end is too light 79 00:02:35,000 --> 00:02:37,440 and it doesn't feel stable at high speed 80 00:02:37,440 --> 00:02:40,200 so the center of mass is the big one and 81 00:02:40,200 --> 00:02:41,720 this is what happens is when we change 82 00:02:41,720 --> 00:02:43,680 people's position around their Center of 83 00:02:43,680 --> 00:02:46,159 mass changes and this explains the 84 00:02:46,159 --> 00:02:48,440 massive sort of discrepancies which you 85 00:02:48,440 --> 00:02:50,680 will see in bike handling like reviews 86 00:02:50,680 --> 00:02:52,560 if you like from people with different 87 00:02:52,560 --> 00:02:54,040 body types and you and I are great 88 00:02:54,040 --> 00:02:55,400 examples of this because we get quite 89 00:02:55,400 --> 00:02:56,720 different impressions of two different 90 00:02:56,720 --> 00:02:59,239 frames and the big reason we get that is 91 00:02:59,239 --> 00:03:00,800 because of the difference in where our 92 00:03:00,800 --> 00:03:03,080 Center of mass is mine is higher and 93 00:03:03,080 --> 00:03:04,760 further forward yours is lower and 94 00:03:04,760 --> 00:03:07,120 further back so we feel the the ride 95 00:03:07,120 --> 00:03:09,879 feel really differently to others so we 96 00:03:09,879 --> 00:03:11,720 tend to I well I tend to take this into 97 00:03:11,720 --> 00:03:14,360 account if I if I'm fitting a person and 98 00:03:14,360 --> 00:03:16,480 I see a person with huge amounts of seat 99 00:03:16,480 --> 00:03:18,159 set back for example because they've got 100 00:03:18,159 --> 00:03:20,760 really long FAS I will do stuff like run 101 00:03:20,760 --> 00:03:22,239 the click position further back on the 102 00:03:22,239 --> 00:03:24,360 shoe to allow their foot to move further 103 00:03:24,360 --> 00:03:26,280 forwards towards the front of the bike 104 00:03:26,280 --> 00:03:28,439 so that we can move their pelvis forward 105 00:03:28,439 --> 00:03:30,120 to basically improve the hand of the 106 00:03:30,120 --> 00:03:32,239 bike and the weight distribution so you 107 00:03:32,239 --> 00:03:33,799 know Center of you you can do a lot of 108 00:03:33,799 --> 00:03:35,720 tricky things with the position to alter 109 00:03:35,720 --> 00:03:37,920 their Center of Mass to make the bike 110 00:03:37,920 --> 00:03:39,319 faster through the corners because 111 00:03:39,319 --> 00:03:41,280 they're more confident on it and also 112 00:03:41,280 --> 00:03:43,000 just to improve their General feel of 113 00:03:43,000 --> 00:03:45,000 the frame and so this is a big one I've 114 00:03:45,000 --> 00:03:46,879 had huge amounts of feedback from people 115 00:03:46,879 --> 00:03:48,439 you know we do a fit and then they they 116 00:03:48,439 --> 00:03:50,760 email me a week later and say m i what 117 00:03:50,760 --> 00:03:53,560 what's going on it's faster downhill and 118 00:03:53,560 --> 00:03:55,560 the frame feels completely different 119 00:03:55,560 --> 00:03:58,000 because we've altered their position so 120 00:03:58,000 --> 00:03:59,959 the position of the rider which affects 121 00:03:59,959 --> 00:04:01,959 their Center of mass is front and center 122 00:04:01,959 --> 00:04:04,720 in terms of bike handling the second 123 00:04:04,720 --> 00:04:07,120 biggest Factor number two the wheelbase 124 00:04:07,120 --> 00:04:08,720 of the bike and you you've experienced 125 00:04:08,720 --> 00:04:09,799 this you've ridden some bikes with 126 00:04:09,799 --> 00:04:11,439 really long wheelbases and some really 127 00:04:11,439 --> 00:04:14,000 short wheelbases you can further break 128 00:04:14,000 --> 00:04:16,399 this down into what we call the front 129 00:04:16,399 --> 00:04:17,959 center which is the distance between the 130 00:04:17,959 --> 00:04:19,959 crank and the front axle and the rear 131 00:04:19,959 --> 00:04:21,478 center which is the distance between the 132 00:04:21,478 --> 00:04:23,880 crank and the rear axle most bikes have 133 00:04:23,880 --> 00:04:25,600 got a pretty similar rear center it's 134 00:04:25,600 --> 00:04:28,960 it's usually 405 to 410 mm but the front 135 00:04:28,960 --> 00:04:31,240 center is very quite a lot due to the 136 00:04:31,240 --> 00:04:33,000 different head angles and all this sort 137 00:04:33,000 --> 00:04:35,680 of stuff so that is the main determinant 138 00:04:35,680 --> 00:04:38,000 of wheelbases is front center changes on 139 00:04:38,000 --> 00:04:41,320 most modern road bikes the the front 140 00:04:41,320 --> 00:04:43,240 center like if you if you make a bike 141 00:04:43,240 --> 00:04:44,880 with a really short wheel base as a 142 00:04:44,880 --> 00:04:47,199 reference point 54 cm bike with a 143 00:04:47,199 --> 00:04:50,680 wheelbase of say 970 mm which is fairly 144 00:04:50,680 --> 00:04:53,320 short this will dramatically sharpen up 145 00:04:53,320 --> 00:04:55,400 the steering the bike will feel very 146 00:04:55,400 --> 00:04:57,600 very Nimble a tiny little bit of input 147 00:04:57,600 --> 00:04:59,199 from the bar will change will make the 148 00:04:59,199 --> 00:05:01,199 frame change Direction it will feel 149 00:05:01,199 --> 00:05:03,600 extremely Nimble and it can sometimes 150 00:05:03,600 --> 00:05:05,280 make them feel a little bit 151 00:05:05,280 --> 00:05:07,639 disconcertingly sharp in the steering 152 00:05:07,639 --> 00:05:10,360 right if the wheelbase is really long 153 00:05:10,360 --> 00:05:11,919 you'll find that it's much more stable 154 00:05:11,919 --> 00:05:14,440 at high speed it doesn't tend to change 155 00:05:14,440 --> 00:05:16,520 direction without you noticing you can 156 00:05:16,520 --> 00:05:18,080 do things like take your hands off the 157 00:05:18,080 --> 00:05:19,919 bar without it kind of wandering all 158 00:05:19,919 --> 00:05:21,639 over the place and you can turn behind 159 00:05:21,639 --> 00:05:23,319 you in a bunch and look and you turn 160 00:05:23,319 --> 00:05:24,639 your head back and you're still going in 161 00:05:24,639 --> 00:05:27,039 the same direction so longer wheelbases 162 00:05:27,039 --> 00:05:29,720 tend to create more stability at the ex 163 00:05:29,720 --> 00:05:32,560 expense of sharper handling and for me I 164 00:05:32,560 --> 00:05:34,479 actually much prefer bikes with a longer 165 00:05:34,479 --> 00:05:36,759 wheelbase those 54 cm frames that you 166 00:05:36,759 --> 00:05:39,199 and I are often reviewing wheelbases 167 00:05:39,199 --> 00:05:42,720 above about 980 9 985 for me feel way 168 00:05:42,720 --> 00:05:44,880 better than a shorter sharper wheelbase 169 00:05:44,880 --> 00:05:46,560 but if you've got a shorter Rider with a 170 00:05:46,560 --> 00:05:48,639 lower Center of mass and a longer stem 171 00:05:48,639 --> 00:05:50,400 they actually often prefer the shorter 172 00:05:50,400 --> 00:05:52,960 wheelbase bike so this is number two is 173 00:05:52,960 --> 00:05:55,000 the wheelbase which is mainly on Modern 174 00:05:55,000 --> 00:05:57,080 road bikes a function of the front 175 00:05:57,080 --> 00:06:00,160 center length so that's that's the two 176 00:06:00,160 --> 00:06:02,479 big ones now lastly the third one I've 177 00:06:02,479 --> 00:06:04,160 got is the frame stiffness and the 178 00:06:04,160 --> 00:06:06,400 weight which sort of often go together 179 00:06:06,400 --> 00:06:08,479 heavier frames being stiffer although we 180 00:06:08,479 --> 00:06:10,160 have had a a very lightweight bike which 181 00:06:10,160 --> 00:06:11,599 we've been reviewing recently which is 182 00:06:11,599 --> 00:06:14,080 very stiff but really stiff frames in 183 00:06:14,080 --> 00:06:16,000 the bottom bracket they tend to handle 184 00:06:16,000 --> 00:06:17,599 better when they're on the limit because 185 00:06:17,599 --> 00:06:19,319 they don't wander around as much you can 186 00:06:19,319 --> 00:06:21,319 load your foot and move it around and it 187 00:06:21,319 --> 00:06:22,960 just it's a more direct feel in the 188 00:06:22,960 --> 00:06:25,039 corners and the frame doesn't feel like 189 00:06:25,039 --> 00:06:26,919 it's it's wobbling in the bottom bracket 190 00:06:26,919 --> 00:06:30,560 so super stiff frames um with typically 191 00:06:30,560 --> 00:06:32,560 with um with a a fair bit of bottom 192 00:06:32,560 --> 00:06:34,160 bracket stiffness in particular and head 193 00:06:34,160 --> 00:06:36,680 tube stiffness really stiff frames do 194 00:06:36,680 --> 00:06:38,560 tend to make the frame feel much more 195 00:06:38,560 --> 00:06:40,639 planted I've had a lot of experience 196 00:06:40,639 --> 00:06:43,000 with quite whippy frames and they feel 197 00:06:43,000 --> 00:06:44,840 great going uphill but downhill they're 198 00:06:44,840 --> 00:06:47,120 kind of not quite as stable so yeah a 199 00:06:47,120 --> 00:06:49,160 really stiff frame bottom bracket and 200 00:06:49,160 --> 00:06:51,479 head and head headset makes a big 201 00:06:51,479 --> 00:06:53,599 difference yeah the big one that we've 202 00:06:53,599 --> 00:06:55,400 sort of left out here which is probably 203 00:06:55,400 --> 00:06:57,199 going to get an honorable mention is the 204 00:06:57,199 --> 00:06:59,720 tire size and the pressure yeah so this 205 00:06:59,720 --> 00:07:01,360 and again these these things are all not 206 00:07:01,360 --> 00:07:03,240 not necessarily geometry considerations 207 00:07:03,240 --> 00:07:05,479 in the frame but the tire size and 208 00:07:05,479 --> 00:07:07,400 pressure if you're running a 30 mil tire 209 00:07:07,400 --> 00:07:12,280 at 50 psi tubeless versus a 25 at 85 PSI 210 00:07:12,280 --> 00:07:14,720 with a tube in it the frame is going to 211 00:07:14,720 --> 00:07:16,840 feel way more planted in the corners due 212 00:07:16,840 --> 00:07:18,479 to the much larger contact patch of that 213 00:07:18,479 --> 00:07:20,800 tire it can be two or three times the 214 00:07:20,800 --> 00:07:22,720 size the contact patch and so when you 215 00:07:22,720 --> 00:07:24,639 tip it into a corner the TIR is going to 216 00:07:24,639 --> 00:07:27,080 deflect onto the road and grip better so 217 00:07:27,080 --> 00:07:28,960 bigger tires make a huge difference so 218 00:07:28,960 --> 00:07:30,400 if you've got a bike that's a little bit 219 00:07:30,400 --> 00:07:32,080 nervous in the handling which you don't 220 00:07:32,080 --> 00:07:34,280 love get the biggest tire on it that you 221 00:07:34,280 --> 00:07:36,039 can and it's going to make a massive 222 00:07:36,039 --> 00:07:38,479 difference to the confidence in the 223 00:07:38,479 --> 00:07:41,280 corners in particular on rough terrain 224 00:07:41,280 --> 00:07:43,319 yeah so those are the big three with a 225 00:07:43,319 --> 00:07:45,080 notable notable number four there being 226 00:07:45,080 --> 00:07:47,199 the tie pressure but Center of mass is 227 00:07:47,199 --> 00:07:49,080 the big one mate and uh it's just my 228 00:07:49,080 --> 00:07:50,720 experience from fitting thousands of 229 00:07:50,720 --> 00:07:53,080 people and the feedback I get that they 230 00:07:53,080 --> 00:07:55,680 often when we fix their position they 231 00:07:55,680 --> 00:07:57,800 notice that the handling of the frame is 232 00:07:57,800 --> 00:07:59,840 way better and it's partly because we've 233 00:07:59,840 --> 00:08:02,400 solved any issues that they had with 234 00:08:02,400 --> 00:08:04,039 where their Center of mass was whether 235 00:08:04,039 --> 00:08:05,960 the seat was too high or too far forward 236 00:08:05,960 --> 00:08:08,400 or back or whatever it was optimizing 237 00:08:08,400 --> 00:08:09,919 the center of mass can make a big 238 00:08:09,919 --> 00:08:11,680 difference to your perception of how the 239 00:08:11,680 --> 00:08:14,240 frame feels makes logical sense does 240 00:08:14,240 --> 00:08:16,560 make logical sense I I do make logical 241 00:08:16,560 --> 00:08:18,120 sense every now and again yes you do it 242 00:08:18,120 --> 00:08:20,039 doesn't happen very often but this is a 243 00:08:20,039 --> 00:08:21,240 notable 244 00:08:21,240 --> 00:08:25,240 exception cheers 17835

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