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Chubby Rubby Thighs + New Bike = Holes in Expensive Bike Shorts

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Chubby Rubby Thighs + New Bike = Holes in Expensive Bike Shorts

Old 10-18-17, 04:37 AM
  #1  
jpescatore
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Chubby Rubby Thighs + New Bike = Holes in Expensive Bike Shorts

After twenty years of riding a Trek 520, I emptied the change jar and bought a Trek 2017 Domane SLR disc bike, which came with a Retul fitting session. 54cm frame, I'm 5'10" with short inseam and about 104kg/230 lbs.

I love the bike and put on a Selle Italia Gel Flow seat. The fitting resulted in raising the seat about 1.5 cm and moving my cleats all the way back on my shoes. The new position was a definite improvement over what I had been using - could just be psychological, but after long rides (50+ miles) I definitely have less knee and rear end "memories."

But, after a number of rides I noticed holes wearing through on my old cheap padded bike shorts on the left thigh. Figured was because they were old, cheap - bought a few pair of new, not so cheap bike shorts - still wore holes in the left thigh. This never happened on the 520, but the slightly different geometry and different seat seemed to change things.

Emailed the bike fitter, he said come on in for a free look. My pedaling stroke is about equal on both sides but seems like left thigh has a bit more relaxed muscle (technical term: fat) than the right one. Looked like seat shape was causing rubbing - he put on a pressure measuring pad, looked like my cycling stroke caused more pressure on left "cheek" area. Tried a number of test seats, a Selle SMP Hybrid changed that. I kept that seat as a loaner - and found I was now wearing a hole on that side in a lower area!

My mistake: Since I wasn't about to put a rear rack and trunk bag on the Domane, I had put on an old Nashbar under seat saddle bag to carry tube, tools, cell phone etc. I generally don't wear jerseys and when I do I've never liked carrying stuff on my back. I took the bag off for the fitting and it looks like the change in seat profile allowed my lower thigh to rub the rough strap holding up the bag, arrgh.

I had a narrow Topeak saddle bag laying around, put that on and I seem to now to be free of the problem. Given the cost of bike shorts, I think a quick visit to a liposuction parlor for my left thigh would have been cheaper than buying those new shorts...
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Old 10-18-17, 06:46 AM
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I had the same problem (i am known as thunder thighs), execpt with tons of chaffing on both thighs. I switched to an ISM noseless saddle (touring model) and problem solved
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Old 10-18-17, 09:05 AM
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Glad to hear that you solved your rubbing problem and that the fitter helped to diagnose it. That's a good fitter to offer to come back and check for free. I looked up your bike and I see that its a nice one. Do you notice any difference with the "iso speed decoupler?" Those Trek Domane SLR Disc bikes go up to $12,000 bucks. Yeeow... BTW, I weigh about the same as you but am a few inches taller. Ride on!
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Old 10-18-17, 11:23 AM
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Mine used to do that when I used those little under the saddle pouches --- I use Turbo and similar saddles mostly and evidently they are slightly narrower than the seat bags I was using
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Old 10-18-17, 11:58 AM
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say no to exposed Velcro on saddle bags around the seat post. Use black tape around the exposed areas if your saddle bag has this.
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Old 10-20-17, 04:16 PM
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Are you telling me your mechanic didn't notice the saddle bag wearing a hole in your bibs?

Well lesson learned I guess. I had to trim the velcro on mine for similar reasons.
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Old 10-22-17, 04:34 AM
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The ISoSpeed “decoupler” in the seatpost and stem is definitely noticeable and effective on rough surfaces. It is not like a mountain bike suspension - pot holes are still pot holes, rail road tracks are still rail road tracks. But, it definition reduced the jolt in the seat on fairly big bumps and reduces the kinda buzz in my hands/arms on corrugated surfaces, like gravel or tar/chip roads. Recently rode a 3 mile stretch of road that had been ground down for resurfacing - did a great job on that.

Miy change jar was definitely need not big enough for the $12k version! My NewYears deal with myself was that if I lost 10 lbs I would buy a bike that weighed 10 lbs less that the 520...


Originally Posted by ptempel View Post
Glad to hear that you solved your rubbing problem and that the fitter helped to diagnose it. That's a good fitter to offer to come back and check for free. I looked up your bike and I see that its a nice one. Do you notice any difference with the "iso speed decoupler?" Those Trek Domane SLR Disc bikes go up to $12,000 bucks. Yeeow... BTW, I weigh about the same as you but am a few inches taller. Ride on!
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Old 10-22-17, 08:16 AM
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Thread needs pics
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Old 10-25-17, 06:50 AM
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Originally Posted by jpescatore View Post
Miy change jar was definitely need not big enough for the $12k version! My NewYears deal with myself was that if I lost 10 lbs I would buy a bike that weighed 10 lbs less that the 520...
Way to keep your eye on the prize! Also a good incentive.
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Old 10-25-17, 06:52 AM
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Originally Posted by trailangel View Post
Thread needs pics
@jpescatore is it the Domane SLR 6 disc?

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Old 10-26-17, 02:28 PM
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I have a bag with no Velcro, it clips onto a bracket attached to the seat.
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Old 11-06-17, 10:20 PM
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I ripped up a lot of bike shorts, upper inner thigh. I would sometimes get just 2 rides before they were unusable. It started after adjustments were made following a bike fit.

The problem was solved by replacing the seatpost with one that had more setback. No more rubbing against the saddle clamping mechanism.
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