Search found 114 matches

by mullinsm
13 Mar 2018, 3:06pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

If you want a comfy ride, try 28mm tyres and you WILL get it; if you want to go faster try 23mm and you WILL go faster. Can someone please close this thread now before Stephen Hawkins gets involved? An appearance by the great man really would make my year! Just a note on the statement above with re...
by mullinsm
13 Mar 2018, 11:04am
Forum: Bikes & Bits – Technical section
Topic: Marathon Supreme wired
Replies: 6
Views: 476

Re: Marathon Supreme wired

That looks like the old version on SPA website. Out of interest do the wired have tougher sidewalls? I've been running folding Supremes for a few years and like them, but am always worried about their fragile sidewalls. Ruined an otherwise good tyre by sliding down a pothole - part of sidewall remo...
by mullinsm
13 Mar 2018, 9:18am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

Is there honestly that much difference between 25mm and 23mm tyres? Been using 23s for years in all weather's, even on tracks and canal bank, no problem. On these tracks you can manage as long as you don't sit on the bike like a sack of spuds. Just wondering. Does 2 mm make that much difference? Be...
by mullinsm
9 Mar 2018, 7:49am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

A lot of unsubstantiated talk about the detriment to performance from the increased weight and drag. Let's put some numbers to that: http://www.slowtwitch.com/Tech/Why_Wheel_Aerodynamics_Can_Outweigh_Wheel_Weight_and_Inertia_2106.html http://www.biketechreview.com/index.php/reviews/wheels/63-wheel-...
by mullinsm
8 Mar 2018, 5:20pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

There are clearly more physicists on this forum than cyclists........
by mullinsm
8 Mar 2018, 4:16pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

I think you got my point. :wink: On a hilly course 5 kg makes a difference , but 120 grams in the wheels, really? All over the world people are brainwashed about wheel weights, 1400 grams are light and 1800 grams are boat anchors. For me it's not much more than fetishism. I know which ones I'd rath...
by mullinsm
8 Mar 2018, 4:16pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

Weight does matter a little bit when accelerating but nothing noticable for your average speed. Are you saying that a heavy bike has the same average speed as a light bike when moving? If so, you're ignoring hills. :wink: And not only hills. The idea that a heavy bike is just as fast as a light bik...
by mullinsm
8 Mar 2018, 3:09pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

IF you compare 2 tyre sizes, then you should use tyres with comparable construction/carcass/thread, otherwise it's useless. The 23,25 and 28mm were all Conti Gatorskins. The only difference apart from the size was the weight. Rolling resistance theory says the 28mm should be quicker on the roads in...
by mullinsm
8 Mar 2018, 1:39pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

IF you compare 2 tyre sizes, then you should use tyres with comparable construction/carcass/thread, otherwise it's useless. The 23,25 and 28mm were all Conti Gatorskins. The only difference apart from the size was the weight. Rolling resistance theory says the 28mm should be quicker on the roads in...
by mullinsm
8 Mar 2018, 12:11pm
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

I understand the science says that rolling resistance improves with bigger tyres on rough roads, but my experience doesn't support the theory. I have a carbon bike with Mavic wheels and 23mm tyres and when I swap them for 25mm tyres, it is noticeably and measurably slower and that is on minor roads ...
by mullinsm
8 Mar 2018, 8:35am
Forum: Bikes & Bits – Technical section
Topic: 25mm tyres
Replies: 86
Views: 5521

Re: 25mm tyres

In my experience, nothing effects the performance of a bike more than the weight of the wheels and smaller tyres will weigh less than larger tyres of the same make and model.
by mullinsm
6 Mar 2018, 3:13pm
Forum: Bikes & Bits – Technical section
Topic: Brake and STI compatability
Replies: 6
Views: 526

Re: Brake and STI compatability

This is a problem I've dealt with over the years and I've found that the Avid Ultimate Shorties are the best with STI levers for touring (see my post on the Thorn Sherpa for more details. Mini V brakes work well, but the clearance can be an issue with mudguards. I've used them with tires up to 35mm ...
by mullinsm
6 Mar 2018, 3:08pm
Forum: Bikes & Bits – Technical section
Topic: Thorn Sherpa
Replies: 11
Views: 1184

Re: Thorn Sherpa

reohn2 wrote:What size is the bike in the photos?


It's a 565s. I'm 5'11" and it's a perfect fit with a 10cm stem.
by mullinsm
6 Mar 2018, 2:21pm
Forum: Bikes & Bits – Technical section
Topic: Thorn Sherpa
Replies: 11
Views: 1184

Re: Thorn Sherpa

what is Thorns thinking in haveing long steerers/tubes above the top tube? seems to be the norm? or is it just buyers buying a small frame then not able to cut down the steerer? Is there any advantage to a small frame and along steerer? In my case I have to get an extension tube with my Dawes 1-Dow...
by mullinsm
6 Mar 2018, 2:14pm
Forum: Bikes & Bits – Technical section
Topic: Thorn Sherpa
Replies: 11
Views: 1184

Re: Thorn Sherpa

A nice purposeful looking bike there....Nice. I would want mudguards...did you ever miss them ?? I have fitted mudguards for commuting but I removed them for the trip to NZ as they are apt to get damaged on the plane and with a tent on the rack, you don't get any spray from the rear wheel anyway. Y...